Management Team

Stephen H. Rusckowski, Chairman, CEO and President

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Steve Rusckowski is Chairman, Chief Executive Officer and President of Quest Diagnostics.


Steve has served as Chairman and Chief Executive Officer of Quest Diagnostics since May 2012. He was elected Chairman of the Board in December 2016.


On February 3, 2022, Quest Diagnostics announced that, as part of a gradual leadership succession plan, Steve will gradually transition his responsibilities as Chief Executive Officer to Jim Davis, who will become CEO on November 1, 2022. At that time, Steve will continue to serve on the Quest Board of Directors as Executive Chairman.


Soon after arriving at Quest in May 2012, Steve has championed a strategy to accelerate growth and drive operational excellence, focusing on improving relationships with health plans and hospital health systems and expanding faster-growing businesses in advanced diagnostics and consumer testing. In doing so, Steve transformed Quest from a laboratory company that was not growing in 2012 to the leader in diagnostic information services with record revenues, earnings, and cash generation in 2021.


Steve has also driven Quest to build a more inclusive, team-oriented culture, which today features more than ten employee business networks, and is overseen by a board of directors composed of 50% women and two people of color. In 2020 he spearheaded the launch of Quest for Health Equity, a $100 million commitment to reduce health disparities among the underserved in the U.S., particularly in communities of color.


Prior to joining Quest Diagnostics, Steve was CEO of Philips Healthcare, which became the largest unit of Royal Philips Electronics under his leadership. He joined Philips in 2001 when it acquired the Healthcare Solutions Group he was leading at Hewlett-Packard/Agilent Technologies.


Steve is a member of the Board of Directors of the American Clinical Laboratory Association and served as its Chairman from 2014 to 2017. He is also an Emeritus Director of Project HOPE, a global health education and humanitarian assistance organization. He earned a Master of Science degree in Management from the Sloan School of Management at Massachusetts Institute of Technology and a Bachelor of Science degree in Mechanical Engineering from Worcester Polytechnic Institute, where he serves on the Board of Trustees.

James E. Davis, CEO-elect

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Jim Davis is CEO-elect of Quest Diagnostics.


On February 3, 2022, Quest announced that, as part of a gradual leadership succession plan, Jim will assume the responsibilities of Chief Executive Officer, effective November 1, 2022, succeeding Steve Rusckowski.


Jim was named to his previous role as Executive Vice President for General Diagnostics in 2017, where he oversaw Quest’s general diagnostics business, accounting for more than 80% of the company’s $10.8 billion revenues in 2021 and encompassing three-quarters of its employee base. He has compiled a strong record of revenue and earnings growth through strengthening relationships with Quest’s largest health plans and its hospital health system customers. Jim also has been responsible for integrating Quest’s regional lab acquisitions. Since early 2020, he has led and advanced the evolution of Quest’s ESG strategy.


Jim joined Quest in April 2013 as Senior Vice President, Diagnostic Services, and he managed a portfolio of businesses and was instrumental in refocusing the business on diagnostic information services. He was then named Senior Vice President of Operations in February 2014.


Before joining Quest, he served as CEO of InSightec, Inc., a medical device company. Prior to that, Jim held senior management positions in a two-decade career in General Electric’s aviation and healthcare businesses, including leading GE’s MRI business for five years. Before GE, Jim led the development of strategic and operating initiatives for clients of McKinsey & Company, Inc. Jim holds a master’s degree in management from the Sloan School of Management at Massachusetts Institute of Technology, a master’s degree in science from MIT and a bachelor's degree in aeronautical engineering from the University of Michigan.

Mark Delaney, Senior Vice President and Chief Commercial Officer

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Mark Delaney is Senior Vice President and Chief Commercial Officer, responsible for all sales operations.


Prior to joining Quest Diagnostics in March 2022, Mark had been Vice President for Sales and Marketing at Hillrom for more than four years, and became Vice President and General Manager at Baxter after it acquired Hillrom.


Previously, Mark had held senior sales and marketing leadership roles at GE Healthcare. Most recently he was Senior Vice President and Zone Manager, where he had regional responsibility for sales of imaging, patient monitoring, IT, and services.


Mark holds a bachelor’s degree in economics from St. Lawrence University and an Executive MBA from Suffolk University.

Catherine T. Doherty, Senior Vice President, Regional Businesses

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Cathy Doherty is Senior Vice President, Regional Businesses. She oversees Quest’s regional and enterprise operations, as well as the commercial organization, marketing, and consumer-initiated testing. She is also responsible for driving operational excellence, including Invigorate, the company’s quality and efficiency initiative. Cathy also co-chairs the company’s Inclusion and Diversity Council and is Executive Sponsor of Quest’s Women in Leadership Employee Business Network. 


Cathy joined Quest Diagnostics in 1990 and most recently was Senior Vice President, Group Executive – Clinical Franchise Solutions & Marketing. Prior to that, she was Senior Vice President, Physician Services Business. Prior to that, she served as Vice President, Hospital Services, and as Vice President, Office of the Chairman.


A certified public accountant, Cathy holds a bachelor’s degree in business administration with a concentration in accounting from Montclair State University, where she serves on the advisory board of the Feliciano School of Business.

Mark Gardner, Senior Vice President, Molecular Genomics and Oncology

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Mark Gardner is Senior Vice President, Molecular Genomics and Oncology for Quest Diagnostics.


In this role, Mark is responsible for driving growth in Quest’s Advanced Diagnostics offerings by providing genetic sequencing services, cancer diagnostics and working closely with all our clinical franchises.


Mark joined Quest in 2022 from Corza Medical, a private equity operating company focused on surgical technologies and tools, where he served as Executive Partner, Senior Vice President and General Manager of European Commercial Operations and Biosurgery Products. Prior to that, Mark served in leadership positions at a range of companies including Thermo Fisher Scientific, Life Technologies, Invitrogen and Omniseq. He started his civilian career as a consultant with the global management consulting firm McKinsey & Company, after leaving the U.S. Navy, where he was a Lieutenant Commander.


Mark earned an MBA from the Wharton School at the University of Pennsylvania, a master’s degree in national security studies from Georgetown University, and a bachelor’s degree from the U.S. Naval Academy.

Karthik Kuppusamy, Ph.D., Senior Vice President, Clinical Solutions

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Karthik Kuppusamy is Senior Vice President, Clinical Solutions for Quest Diagnostics.


In this role, Karthik is responsible for setting and executing the strategy for growth and innovation across Quest’s clinical franchises as well as Pharma Services, Genomic Services, and Global Markets. The clinical franchises include: Cardiovascular, Metabolic and Endocrinology; Drug Monitoring & Toxicology; Infectious Disease & Immunology; Neurology; and Women’s & Reproductive Health. Working closely with Quest’s leader of Molecular Genomics and Oncology, he ensures that Quest is well positioned in advanced diagnostics with world-class tests and solutions required for physicians and patients.


Previously, Karthik served as Vice President and General Manager of Quest’s North Region, from 2018 to 2022. Prior to that, he was the General Manager of the Neurology Franchise & Consumer Genetics at Quest Diagnostics from 2014 to 2017.


He has more than 25 years of combined healthcare and life sciences experience leading large cross-functional teams. Karthik joined Quest in 2014 from GE HealthCare’s Diagnostic Imaging Division where he held General Manager roles in product development, R&D, sales, and marketing.


Karthik earned a Ph.D. in electrical and biomedical engineering from Washington University in St. Louis, an MBA in finance and operations from Marquette University, Milwaukee, a master’s degree in electrical & biomedical engineering from the Indian Institute of Technology, Madras, and a bachelor’s degree in electronics and communications engineering from Anna University, Madras, India.


Karthik is a co-chair for Quest’s Inclusion and Diversity Council.

Cecilia McKenney, Senior Vice President, Chief Human Resources Officer

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Cecilia McKenney is Senior Vice President, Chief Human Resources Officer for Quest Diagnostics. She is responsible for all human resources activities across the company. Cecilia is the executive sponsor for the Safely Working Together team throughout the COVID-19 pandemic. She is the co-sponsor for Quest Diagnostics’ Quest for Health Equity initiative and the PRIDE employee business network.


Prior to joining Quest in February 2018, Cecilia spent more than a decade at Frontier Communications, where she led the telecommunications company’s human resources function, as well as held senior leadership roles leading the Consumer Division and sales, marketing, business operations and customer service. Before Frontier, she served in various HR leadership roles at PepsiCo over a period of 16 years.


Cecilia is a member of the Board of Trustees of Catholic Charities, Archdiocese of New York, and the St. Joseph’s Health Foundation.


She earned a bachelor’s degree in business administration at Franklin & Marshall College, and a Certified Employee Benefits Specialist certification from the Wharton School at the University of Pennsylvania and the International Foundation of Employee Benefit Plans.

Patrick Plewman, Senior Vice President, Diagnostic Services

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Patrick Plewman is Senior Vice President for Diagnostic Services.


In this new role, he is responsible for growing a portfolio of data driven analytics and services businesses, which enable employers, providers, and others to deliver health care more effectively and efficiently. This portfolio includes Employer Population Health, Employer Solutions, ExamOne, Healthcare Analytic Solutions, Quest HealthConnect, and the recently acquired Pack Health.


Patrick had led Quest’s West region as Vice President and General Manager. Since joining the company in 2013, he has led several of Quest’s clinical diagnostic franchises.


Prior to joining Quest, he held executive, business development and strategy roles in molecular diagnostics at SmithKline Beecham and diaDexus.


Patrick earned a bachelor’s degree with distinction in chemistry and political science from the University of North Carolina at Chapel Hill, where he made Phi Beta Kappa and was a Morehead-Cain Scholar. He holds an MBA from Harvard Business School.

Michael E. Prevoznik, Senior Vice President & General Counsel

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Mike Prevoznik is Senior Vice President and General Counsel for Quest Diagnostics.


In addition to ensuring that Quest Diagnostics meets all of its legal requirements as a public company, he is responsible for security and government affairs. Mike is also co-Executive Sponsor of Quest for Health Equity, Quest’s initiative that has committed more than $100 million to address health disparities across the country.


Mike’s career at Quest has included many additional leadership responsibilities. From April 2011 to January 2017, Mike had management responsibility for the company’s diagnostic information services activities outside of the U.S., and from April 2011 to January 2013, he had management responsibility for the company’s clinical trials business. From 1999 until April 2009, Mike also had responsibility for the Company's Compliance Department. He was appointed Vice President and General Counsel in 1999 and was named a Senior Vice President in 2003.


Mike joined Quest Diagnostics in 1999 through the acquisition of SmithKline Beecham Clinical Laboratories (SBCL). He joined SBCL in 1994 as Chief Legal Compliance Officer, and in 1996 was named Vice President and Chief Legal Compliance Officer for SmithKline Beecham Healthcare Services. In 1998, Mike was appointed Vice President, Compliance, for SmithKline Beecham, a role in which he developed and led the company’s global compliance activities. Prior to joining SmithKline Beecham, Mike represented SBCL as outside legal counsel as an Associate with Dechert Price & Rhoads of Philadelphia, where he specialized in healthcare and general corporate law.


Mike earned his JD degree from the University of Pennsylvania Law School, an MBA from the University of Chicago, and a bachelor’s degree from the University of Notre Dame.

Sam Samad, Executive Vice President and Chief Financial Officer

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Sam Samad is Executive Vice President and Chief Financial Officer for Quest Diagnostics. He joined Quest in July 2022.


He is responsible for the company's finance, accounting, investor relations, internal audit, and treasury functions


Sam joined Quest Diagnostics from Illumina, Inc., where he served as Chief Financial Officer since 2017. At Illumina, a global leader in DNA sequencing and array-based technologies, Sam was responsible for the company's finance, accounting, investor relations, internal audit, and treasury functions.


Before joining Illumina, Sam held several senior leadership positions at Cardinal Health, including SVP and Corporate Treasurer. During his tenure as Treasurer, he also had operational and financial responsibility for Cardinal Health's China business. He previously served as SVP and CFO for Cardinal Health's $85 billion pharmaceutical segment, among other leadership roles. Prior to Cardinal Health, he spent 13 years at Eli Lilly and Company in a variety of sales and finance roles, both domestically and internationally, including as CFO of the company's Canada affiliate.


Sam holds a BBA degree from the American University of Beirut in Lebanon and an MBA from McMaster University in Canada. He also serves on the board of directors of IDEXX Labs, Inc.

Gary D. Samuels, Senior Vice President, Chief Communications Officer

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Gary Samuels is Senior Vice President, Chief Communications Officer for Quest Diagnostics.


In this position, he is responsible for internal and external communications, including social media. In addition, Gary is executive sponsor for the company’s Caregivers employee network.


He joined Quest Diagnostics in November 1996, before it was spun off by Corning Incorporated into an independent, publicly held company. Gary became a member of the Senior Management Team in January 2012.


Previously, he was an award-winning journalist, most recently at Forbes Magazine, where he held a variety of senior editorial positions during his 12-year tenure, including Senior Editor and Chicago Bureau Chief.


Gary earned a bachelor’s degree with honors in political science from Middlebury College and a master’s degree in journalism from Columbia University.

Dermot Shorten, Senior Vice President, Strategy, M&A and Ventures

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Dermot Shorten is Senior Vice President, Strategy, M&A and Ventures for Quest Diagnostics. He is based in Secaucus, New Jersey, and is responsible for the company’s business development activities, as well as the strategy, mergers and acquisitions, and planning processes.


Previously, Dermot has been Vice President, Strategy and Ventures; Vice President, Office of the Chairman; and Vice President, Shared Service Operations. Prior to joining Quest Diagnostics in 2008, he served as Vice President, Operations Practice at Booz and Company, where he had been a strategic adviser to Quest Diagnostics for more than 10 years. Dermot was employed by Booz and Company for 18 years where he was responsible for the firm’s global supply chain service offerings.


Dermot earned a master’s degree in natural sciences from Cambridge University, a diploma in computer science from Cambridge University, a master’s degree in operations research from Lancaster University and a master’s degree in private and public management from Yale University.

Kristin Wallace, Senior Vice President, Compliance

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Kristin Wallace is Senior Vice President, Compliance for Quest Diagnostics.


Kristin and her team are responsible for working with all Quest Diagnostics employees to ensure that the company remains fully compliant with the law.


She joined Quest in 2009 as Senior Corporate Counsel and has supported many parts of the business, including operations, franchises, compliance, and billing. Kristin has a special expertise in privacy law. She was appointed Chief Regulatory Counsel in 2018, and had responsibility for providing legal guidance for compliance, regulatory, FDA, and privacy issues in support of business operations, commercial, and accelerating growth. Most recently, as Chief Regulatory Counsel, she played a pivotal role throughout the pandemic with her leadership and team’s stewardship of the EUAs for COVID-19 tests with the FDA and counsel on a myriad of contracts and commercial arrangements in support of our COVID-19 response.


Kristin earned a bachelor's degree from West Chester University of Pennsylvania and a J.D. degree from Villanova Law School. She is a member of Quest's Inclusion and Diversity Counsel and has served on the Quest for Health Equity Oversight Committee and the QuestCAN National Leadership Team.

Jay G. Wohlgemuth M.D., Senior Vice President, R&D, Medical and Chief Medical Officer

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Jay Wohlgemuth, M.D., is Senior Vice President, R&D, Medical and Chief Medical Officer for Quest Diagnostics. Based at Quest Diagnostics Nichols Institute, in San Juan Capistrano, California, Dr. Wohlgemuth is responsible for Research & Development, Medical Affairs, and Medical/Lab Quality.


In addition, Dr. Wohlgemuth is responsible for improving outcomes for employees who use our health benefits. Work for which he and his team received a C. Everett Koop Award for best population health program in 2020.


Dr. Wohlgemuth has many years of experience in medical diagnostics, and research and development. He rejoined Quest in 2016 from HealthTap, a health information start-up, where he served as Senior Vice President and Chief Healthcare Officer. Prior to that, he was Senior Vice President, R&D, Medical and Chief Scientific Officer with Quest. Dr. Wohlgemuth originally joined us in 2009 from Genentech, where he was Director, Clinical Diagnostics, ITGR (Immunology, Tissue Growth and Repair) and Global Development Team Leader for Ocrevus (Ocrelizumab), a therapy for Multiple Sclerosis. Before that, he served as Vice President, Research and Development for VIA Pharmaceuticals and as Chief Medical Officer for the leading molecular testing company in the immunology space, CareDx, a company he co-founded (formerly known as XDx). Dr. Wohlgemuth also served as XDx’s Vice President, Research & Development, and for his work there was awarded Technology Pioneer 2005 at the World Economic Forum in Davos. He serves on the board of directors for the Personalized Medicine Coalition, Diagnostic Labs of Oklahoma and The Anne and Henry Zarrow Charitable Foundation.


Dr. Wohlgemuth earned his bachelor’s degree in biology from Harvard College and his medical degree from Stanford University School of Medicine, where he also served a fellowship in cardiovascular medicine.

Gabrielle Wolfson, Senior Vice President, Chief Information & Digital Officer

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Gabrielle Wolfson is Senior Vice President, Chief Information & Digital Officer for Quest Diagnostics.


She leads technology, informatics, and digital solutions at Quest, continuing the important work of the Healthcare Technology and Analytics Solutions (HTAS) team to empower consumers, providers, health systems and payers with critical insights to effectively manage population health. Gabrielle also leads the Quanum Enterprise Content and Practice Solutions businesses, and co-leads the company’s Pan-Asian Leaders employee network.


Prior to joining Quest in 2019, she served as Chief Information Officer for Xerox Corp. beginning in 2016. There Gabrielle worked on transforming a high cost, complex technology landscape into a dynamic digital business, offering services on demand both internally and externally. She also developed a global data strategy to enable advanced analytics, artificial intelligence, and machine learning to deliver business insights and improved customer services. Prior to Xerox, Gabrielle was CIO at Wyndham Hotels and Resorts, Panasonic, Integra Life Sciences and Par Pharmaceutical. Earlier, she was a practice leader in life sciences and pharmaceutical industries at PricewaterhouseCoopers.


Gabrielle holds a master’s degree in technology management from Columbia University and a bachelor’s degree in mathematics from Queens College in New York City. She is also a Member of the Governing Body of the Society of Information Management (SIM) and a frequent speaker at CIO executive forums.