HJF Leadership




Joseph Caravalho, Jr., M.D., MG, U.S. Army, Ret.

President and Chief Executive Officer, serving HJF since 2017

Dr. Caravalho is responsible for the guidance and leadership of HJF. He sets strategic goals and guides HJF in advancing military and civilian medicine. 

Prior to joining HJF, Dr. Caravalho served as the Joint Staff Surgeon at the Pentagon in Washington, D.C. He was the Chief Medical Adviser to the Chairman of the Joint Chiefs of Staff, providing recommendations to the Chairman, the Joint Staff and Combatant Commanders on a wide range of medical and readiness issues.

Before becoming Joint Staff Surgeon, he was Army Deputy Surgeon General and Deputy Commanding General (Support) of the U.S. Army Medical Command. Clinically, Dr. Caravalho held positions as a staff internist, nuclear medicine physician and cardiologist.

Dr. Caravalho graduated with a M.D. from the Uniformed Services University of the Health Sciences School of Medicine in 1983. He also has a B.A. in math from Gonzaga University, and a master’s degree in Strategic Studies from the Army War College. In 2019 he received an honorary doctor of laws from Gonzaga University. 

For more than 30 years, he has served the U.S. Army in various leadership positions, including Commanding General of the Southern Regional Medical Command and Brooke Army Medical Center, the Northern Regional Medical Command, and the Army Medical Research and Materiel Command at Fort Detrick in Maryland.


Elizabeth "Betsy" Folk

Executive Vice President and Chief Operating Officer, serving HJF since 1992

Ms. Folk is responsible for keeping the headquarters functions coordinated and synchronized on behalf of the president and CEO.

Prior to serving as Executive Vice President and Chief Operating Officer, she led HJF’s Office of Sponsored Programs and Acquisitions, which serves as the central point of contact for administration of grants and contracts awarded to HJF. The office handles many activities, including award set-up, management and compliance, procurement of supplies and services, and negotiation and management of agreements with collaborating institutions.

Before joining HJF as manager of the Finance Department, Ms. Folk worked for Deloitte as a CPA for five years. She has held various roles at HJF, including Director of Financial Planning and Vice President of Program Services. She has an MBA from the University of Maryland.

Catherine Clark


Catherine M. Clark, J.D.

Senior Vice President, General Counsel and Secretary, serving HJF since 2015

Ms. Clark leads HJF’s legal and technology transfer teams in support of our mission and advises management and the Council of Directors on legal matters affecting the organization.

Before joining HJF as Assistant General Counsel in 2015, Ms. Clark served as Vice President and Assistant General Counsel of Vencore, Inc. (formerly QinetiQ North America, Inc.), and held prior positions with other government contracting organizations and in private practice.

Ms. Clark received her B.A. cum laude from Dickinson College and her J.D. magna cum laude from the Catholic University of America’s Columbus School of Law where she served on the Editorial Board of the Law Review.

Cynthia Gilman


Cynthia L. Gilman, J.D.

Senior Vice President, Strategic Initiatives, serving HJF since 2007

Cynthia Gilman supervises all strategic initiatives, business development and public-private partnership efforts.

Previously, Ms. Gilman led the Center for Public-Private Partnerships, where she directed the effort to foster collaborations among the Department of Defense, Department of Veterans Affairs, and civilian universities and industries to advance the long-term health and well-being of America’s wounded, ill and injured service members, veterans and their families. She also led the Heroes of Military Medicine Awards dinners and The Veterans Metrics Initiative.

Prior to joining HJF, Ms. Gilman was a partner for 11 years in a Washington, D.C., law firm after practicing law for 10 years in San Diego. She received her bachelor’s from Emory University and her J.D. from the University of San Diego School of Law. She also studied for one year at the London School of Economics.

Michael Stambaugh


Michael Stambaugh, GPHR, SPHR

Senior Vice President and Chief Human Resources Officer, serving HJF since 2018

Mr. Stambaugh acts as HJF’s principal strategic advisor on global human capital and human resources directives and initiatives and is responsible for leading a human resources team that is flexible, responsive and focused on customer service.

Prior to joining HJF, Mr. Stambaugh was Vice President for Human Resources at Women for Women International, which serves women who are survivors of war in post-conflict and conflict-affected countries. He was also Director of International Human Resources at Creative Associates International and spent 10 years overseas with Kellogg Brown & Root.

Mr. Stambaugh is an Army veteran. He received his master’s degree in human resources and employee relations from Penn State.

Corey Hastings


Corey Hastings, MBA, CPA

Senior Vice President, Chief Financial Officer and Treasurer, serving HJF since 2018

Mr. Hastings is responsible for ensuring the integrity of HJF’s financial and budgetary controls and reporting systems, ensuring adequate financial flexibility to execute the company’s operating and strategic plans, and informing executive decision-making across HJF.

Prior to joining HJF, Mr. Hastings was with the AARP Foundation as Vice President, Workforce Programs. He was promoted from Director of Finance. He was also previously Executive Manager of the Uniformed Services University’s Center for Neuroscience and Regenerative Medicine. He also held finance and management positions with Development Alternatives, Inc. and HJF, as a Program Manager at Uniformed Services University.

He received a MBA from the Raymond A. Mason School of Business at William and Mary and a B.A. in English from the University of Virginia in Charlottesville.

Photo of Dr. Merlin Robb


Merlin Robb, M.D.

Vice President & Chief Medical Officer, serving HJF since 2001

Dr. Merlin Robb advises HJF leadership and staff on all medical-related matters. A retired Lieutenant Colonel from the United States Army Medical Corps, he is a board-certified pediatric infectious disease specialist. For 17 years, Dr. Robb served as HJF’s Program Director in support of the Military HIV Research Program (MHRP), which is part of the Walter Reed Army Institute of Research (WRAIR). He played an essential role establishing the program’s vaccine development efforts in East Africa, where he helped create durable partnerships with African collaborators.

Dr. Robb completed his internship and residency at Madigan Army Medical Center, Tacoma, Washington. He was also a Fellow in Pediatric Infectious Diseases at Walter Reed Army Medical Center, Washington, DC. He received his M.D. from Baylor College of Medicine in 1981.

Alyssa Shepard


Alyssa Shepard, Ph.D.

Vice President for Research Administration, serving HJF since 2001

Dr. Shepard leads HJF’s Office of Research Administration, which serves as the central point of contact for managing grants and contracts awarded to HJF. The office handles numerous activities, including award set-up, management and compliance, procurement of supplies and services, and negotiation and management of agreements with collaborating institutions.

Before joining HJF as Manager of Intellectual Property, Dr. Shepard worked in the biotech industry in both research and technology transfer positions. She has held various roles at HJF, including HJF Director of Intellectual Property and Director of USU Services.

She has a Ph.D. from Harvard and is a Registered Patent Agent.


Jessica A. Bejarano, J.D.

Vice President and Chief Ethics and Compliance Officer, serving HJF since 2018

Ms. Bejarano is responsible for establishing, maintaining and overseeing an effective compliance and ethics program for the Foundation.

Prior to joining HJF, Ms. Bejarano served as Chief Ethics and Compliance Officer at PAE where she was responsible for the ethics and compliance program, the Code of Conduct, ethics and compliance training, and leading investigations as needed. She also chaired the Compliance Council and Privacy and Data Protection Council. Ms. Bejarano also served as an Empowered Official for the International Trade Compliance Office and managed government contracts for Lockheed Martin.

Ms. Bejarano received her bachelor's degree in Government and International Relations from Cornell University, and her J.D. and General Counsel Certificate from Syracuse University College of Law.



Vice President and Chief Information Officer, serving HJF since 2016

Mr. Jan is responsible for directing IT operations, including the strategy, execution and management of HJF's technical assets. He previously served as Chief Information Security Officer (CISO) and launched HJF's Global Information Security Office.

As CISO, Mr. Jan directed staff in identifying, developing, implementing and maintaining processes across HJF to reduce IT risks and protect HJF’s information according to U.S. cybersecurity regulations. Mr. Jan also developed the Cybersecurity Awareness Program to maintain awareness among HJF employees.

Mr. Jan holds a bachelor's degree in Business Administration (Finance) from Frostburg State University. He is a member of (ISC)², an international nonprofit association for information security leaders. He has been a Payment Card Industry Professional and Internal Security Assessor from the PCI Security Standards Council and is currently a Certified Third-Party Risk Professional from Shared Assessments. He is also a member of the ISACA CSX Working Group and sits on the Enterprise Mobility Advisory Board.


Hilary Longo

Vice President, Communications, serving HJF since 2018

Ms. Longo is responsible for the Public Relations, Communications and Design functions worldwide. She spearheads all corporate marketing, branding and communication efforts, internally and externally. Ms. Longo is responsible for the development, implementation and measurement of the HJF strategic communications plan.

Prior to joining HJF, Ms. Longo led strategic communications and marketing functions for international high-tech organizations where she created, socialized and implemented multi-channel communication programs to support corporate objectives. She was Principal and Chief Marketing Officer for Marketing Habit, and Vice President, Marketing, North America, for Eurotech.

Ms. Longo has a M.S. in technology management from the University of Maryland University College and a B.S. in technical communications from Clarkson University.



Philip A. Odeen

Chairman Philip A. Odeen is Lead Independent Director of global power company AES Corp., and non-executive Chairman of Convergys Corp., which is engaged in customer management and information management. He retired in 2002 as Chairman of TRW Inc., an aerospace, defense and automotive company that merged with defense contractor Northrop Grumman.

Previously, he was President and Chief Executive Officer of BDM International Inc., an IT firm acquired by TRW. Before joining BDM, Odeen was Vice Chairman of Management Consulting Services at accounting firm Coopers & Lybrand. He has served on several Department of Defense advisory boards.


U.S. Senator Jim Inhofe (R-Oklahoma)

U.S. Senator Jim Inhofe (R-Oklahoma) is the chairman of the Senate Armed Services Committee. He has a long history of public service, beginning with his service in the U.S. Army to his current role in the United States Senate. 

In addition to his role on the Armed Services Committee, Sen. Inhofe is also a member of the Environment & Public Works Committee, the Commerce Committee and the Small Business Committee. Prior to serving the people of Oklahoma in the U.S. Senate, Sen. Inhofe served in the U.S. House of Representatives, the Oklahoma House and Senate and as Mayor of Tulsa, Oklahoma.


U.S. Senator Jack Reed (D-Rhode Island)

U.S. Senator Jack Reed (D-Rhode Island) is the ranking member of the Senate Armed Services Committee. After graduating from the United States Military Academy in 1971, he received an active-duty commission in the Army.

Over the course of his military career, he earned the Army Commendation Medal with Oak Leaf Cluster, Ranger Tab, Senior Parachutist Badge, and Expert Infantry Badge. He later earned a master’s in public policy from Harvard’s John F. Kennedy School of Government and a law degree from Harvard Law School in 1982.

He served three terms in the Rhode Island State Senate and three terms in the U.S. House of Representatives. Sen. Reed was elected to the U.S. Senate in 1996.


U.S. Representative Salud Carbajal (D-California)

Representative Salud Carbajal, a Democrat who serves California’s 24th congressional district, is a member of the House Committee on Armed Services.

He attended the University of California, Santa Barbara and Fielding Graduate University, where he earned a master’s in organizational management. Rep. Carbajal also served in the United States Marine Corps Reserve for eight years.

Before his election to the U.S. House of Representatives in 2016, he served on the Board of Supervisors for Santa Barbara County.


U.S. Representative Scott DesJarlais (R-Tennessee)

Representative Scott DesJarlais is currently serving his fourth term in Congress representing Tennessee's fourth congressional district. He serves on several committees in the House, including Oversight and Government Reform, Armed Services, Agriculture, Subcommittee on Readiness, and Subcommittee on Seapower and Projection Forces.

He is also a member of the House Freedom Caucus as well as the GOP Doctors Caucus.

Rep. DesJarlais earned degrees in chemistry and psychology from the University of South Dakota and went on to receive his M.D. from the University of South Dakota School of Medicine.


Richard W. ("Tom") Thomas, M.D., D.D.S., MG, U.S. Army, Ret.

Dr. Thomas is the sixth President of the Uniformed Services University of the Health Sciences. He is responsible for the academic, research and service mission of the University. He advises the assistant secretary of defense for health affairs and the four surgeons general on a wide array of issues related to graduate health professions, education and health care research.

He retired from the Army in May 2016 at the rank of Major General. He is a physician and dentist whose last assignment was Chief Medical Officer and Director of the Defense Health Agency Healthcare Operations Directorate.

He graduated from West Virginia University (WVU) on an ROTC scholarship in 1981. He is a graduate of the WVU School of Dentistry and served in the U.S. Army Dental Corps before receiving his M.D. from the WVU School of Medicine in 1994. He earned a master’s degree in Strategic Studies from the U.S. Army War College in 2006.


The Honorable Beverly Byron

The Honorable Beverly Byron served seven successive terms in Congress as a Democratic representative from Maryland.

She was the first woman to head a subcommittee of the House Armed Services Committee, chairing the Military Personnel and Compensation Subcommittee, where she oversaw more than 40 percent of the Department of Defense’s budget. She also chaired the House Special Panel on Arms Control and Disarmament. She was named to the Defense Base Closure and Realignment Commission in 1993.


The Honorable John H. Dressendorfer

The Honorable John H. Dressendorfer retired as Vice President of Government Affairs at L-3 Communications Corp. Previously, he was Vice President of Government Relations for Titan Corp., which L-3 acquired in 2005.

Prior to working with Titan Corp., he was Vice President of Government and External Affairs for the American Forest & Paper Association. He was President and Founder of the lobbying firm Dressendorfer Laird.

He also served as a Special Assistant to the President for Legislative Affairs under President Reagan and was an Assistant to Secretary of Defense Melvin Laird during the Nixon administration.


Marine Corps General John (“Jay”) Paxton, Jr., Ret.

Marine Corps General John (“Jay”) Paxton, Jr., Ret., joined the Council of Directors in 2017. He served as the 33rd Assistant Commandant of the Marine Corps before retiring in 2016. As the second-highest ranking officer in the Marine Corps, he played a critical role in ensuring the health and wellbeing of Marines. With deployments to locations worldwide, he emphasized, advocated and recommended priorities for the Marine Corps.


Tom Weston, CPA

Thomas W. Weston, Jr., is Senior Vice President, Chief Financial Officer, Treasurer and Secretary of ECS Federal, LLC, based in Fairfax, Virginia. He leads the key accounting and finance initiatives of the approximately $600 million company and plays a vital role in driving strategic direction through a focused mergers and acquisitions program. In 2017, Weston led ECS’s successful adoption of a new $200 million credit facility as part of a significant corporate acquisition and, in 2018, led the sale of ECS to a large publicly held company.

Prior to his work at ECS, Mr. Weston was executive vice president, CFO, Treasurer and Secretary for Acentia, LLC, a company focused largely in health care IT services in the federal industry. He also served on the Acentia Board of Directors.