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Leadership Team

Mark Shaver

Mark Shaver, M.B.A.

Vice President – JHM Business Development & Strategic Alliances

Mark Shaver, Vice President of Business Development and Strategic Alliances (BDSA) for Johns Hopkins Medicine, an $8 billion integrated global health enterprise and one of the leading health care systems in the United States. He leads the institution’s national strategy to commercialize its healthcare delivery assets. Mr. Shaver and his team are responsible for identifying and expanding business opportunities with large employers, key advocacy groups, care delivery systems and other key strategic partners in alliance with the institution’s senior leadership and world class faculty.

Among his team’s recent achievements are the acquisition of All Children’s Hospital in St. Petersburg Florida and the formation of a unique joint venture with Walgreens, the country’s leading drug retailer chain. Mr. Shaver’s team also negotiated key strategic collaborations with start-up entities Protenus, MiLab and Artifact Health, as well as with publically traded firms such as GE Healthcare, Cardinal Health, Premier Inc, Welltower and Under Armour. Mr. Shaver also led the negotiations to merge Sleep Services of America into Medbridge in 2016.

Prior to being named to his current position, Mr. Shaver served Johns Hopkins Medicine as head of strategic alliances for Johns Hopkins Medicine International (JHI) where he was responsible for cultivating and leading key partnerships and business development activities worldwide. During his tenure with JHI, Mr. Shaver helped secure and lead key health care affiliations and partnerships in Japan, Mexico, Turkey, Canada, Panama and Trinidad and Tobago.

Mr. Shaver serves on the Baltimore City Partnership Board for the United Way of Central Maryland, is a board member of Medbridge and serves on advisory boards for Walgreens, Pager and the JH Technology Innovation Center. He holds an M.B.A. from the University of Maryland’s R.H. Smith School of Business and a BS in business administration from Towson State University.

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Jonathan Zenilman M.D.

Jonathan Zenilman M.D., FACP, FIDSA

Executive Medical Director

  • Professor of Medicine and Chief of the Infectious Diseases Division at the Johns Hopkins Bayview Medical Center
  • Associate Medical Director of the Johns Hopkins Wound Center
  • Joint appointments at the Johns Hopkins Bloomberg School of Public Health in the Department of Population and Family Health Sciences; Department of Epidemiology.

Dr. Zenilman is known internationally for his work in infectious disease epidemiology. Prior to coming to Johns Hopkins in 1989, he was a medical epidemiologist at the US Centers for Disease Control (CDC) where he conceived, developed, and implemented the National Gonococcal Isolate Surveillance Program (GISP). GISP operated continuously since 1987, and has been responsible for identifying multiple types of resistant strains before they became large clinical problems.

In Baltimore, his activities have included directing the Baltimore City Health Department Sexually Transmitted Infection (STI) program and developing the multi School Johns Hopkins Center for STI Prevention and Training.  He was one of the first to apply GIS technology to public health, and his syphilis mapping project was highlighted in Malcolm Gladwell’s “The Tipping Point”. In addition to being a productive researcher and clinician, he has been active in health policy, has served as a was a Senior Medical Advisor for the Office of the Assistant Secretary for Planning and Evaluation (DHHS) 1995-1997, and has testified before Congress and the Maryland legislature on infectious diseases related issues.

He became Chief of the Infectious Diseases Division at Johns Hopkins Bayview in 2003. Under his leadership, the Bayview Division has increased from 1.5 to 9 faculty members, and developed major clinical and research programs in STIs, hospital epidemiology, antibiotic stewardship and skin and soft tissue infections. Bayview has also become a center for Phase1 through Phase 3 clinical trials for new antimicrobials and wound care products.

Dr. Zenilman has >290 publications and is can active teacher, and has mentored > 40 fellows and residents during his career. He received his BA from Cornell University in chemistry his MD from SUNY-Downstate in Brooklyn NY, and trained at SUNY-Kings County Hospital in Internal Medicine and did his infectious diseases fellowship at Emory University in Atlanta. He is board-certified in internal medicine and infectious diseases, and is a Fellow of the American College of Physicians and of the Infectious Diseases Society of America.

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Dr. Bruce Leff, photo

Bruce Leff, M.D., F.A.C.P., A.G.S.F.

Medical Director

  • Professor of Medicine, Johns Hopkins University
  • Joint Appointment in the Department of Health Policy and Management
  • Director, Center on Aging and Health Program in Geriatric Health Services Research

Dr. Leff is an internationally recognized leader and researcher in the development, evaluation, and dissemination of novel models of care for older adults, including the Hospital at HomeGuided Care, geriatric service line models (www.med-ic.org), and medical house call practices. In addition, his research interests extend to issues related to multi-morbidity, performance measurement, and case-mix issues. He has a strong interest in health policy issues, is a Health and Aging Policy Fellow of the American Political Science Association, and has served on multiple technical expert panels for the center for Medicare and Medicaid services. Dr. Leff is an award-winning teacher and mentor and is also involved in directing the basic Medicine Clerkship in the School of Medicine. He currently serves as President of the American Academy of Home Care Physicians as well as a member of the Board of Regents of the American College of Physicians.

As medical director, Dr. Leff will represent faculty, clinical staff, and researchers at Johns Hopkins and sever as a liaison with the business development team. In this capacity he will serve as an advisor to the team for any academic issues and considerations in the ongoing development of projects and products. 

Dr. Leff received his B.A. from the University of Pennsylvania in 1983 and his M.D. from New York University in 1987. After residency and fellowship training at Johns Hopkins, he served as a medical officer in the US army in Seoul, Korea, before joining the faculty in the Department of Medicine in 1994.  He serves on the scientific advisory board of Amedysis (AMED) and the clinical systems innovation community for the West Health Institute.

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Myron L. Weisfeldt, M.D. Medical Director

Myron L. Weisfeldt, M.D.

Medical Director

  • University Distinguished Service Professor, Department of Medicine Former Director of the Johns Hopkins Department of Medicine (2001-2014)

Dr. Weisfeldt recently stepped down as the Director of the Department of Medicine at Johns Hopkins. In addition to his work with Business Development and Strategic Alliances, he works with the Fund for Johns Hopkins Medicine focusing on fundraising for the Department of Medicine and the School of Medicine. He is perhaps known best for his work in CPR and public access to defibrillators. His area of research focus has been heart function, particularly related to aging and heart attacks.

He currently heads the Resuscitation Outcomes Consortium (ROC), an international network of EMS systems in 11 major cities or regions co-sponsored by the National Heart, Lung and Blood Institute, the US Army, Canadian Health Agencies and Defense Canada and AHA.  ROC is the first group to conduct large-scale clinical trials to improve survival from cardiac arrest and severe traumatic injury.

From 1991 to 2001 Dr. Weisfeldt was Chair of Medicine at the Columbia-Presbyterian Medical Center in New York City. He served as Director of the Department of Medicine and the William Osler Professor of Medicine at the Johns Hopkins University School of Medicine from 2001 to 2014. During his tenure as Director, the Department of Medicine was consistently rated the number one academic department in the United States by US News and World Report and received more NIH funding than any other single Medicine Department.

Dr. Weisfeldt graduated from Johns Hopkins Medical School and did his post-doctoral training at Columbia Presbyterian, at the NIH, and finally cardiology fellowship at the Massachusetts General Hospital.  Soon after assuming a faculty position at Johns Hopkins, he was named an Established Investigator of the American Heart Association.  From 1975 to 1991 he headed the Division of Cardiology at Johns Hopkins.

Dr. Weisfeldt is a former president of the American Heart Association and a member of the Institute of Medicine, the American Society for Clinical Investigation, the Association of American Physicians, Association of Professors of Medicine and the American Clinical and Climatological Association.  He received the Diversity Award from the Association of Professors of Medicine.

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Martha Zeiger

Martha Zeiger, M.D.

Associate Dean for Postdoctoral Affairs

  • Associate Vice Chair of Research for Department of Surgery
  • Co-Director, Basic and Translational Research
  • Chief, Endocrine Surgery
  • Professor, Cellular and Molecular Medicine
  • Professor of Surgery
  • Professor of Oncology

Dr. Martha Zeiger is currently professor of surgery, oncology, cellular and molecular medicine, associate vice chair of surgery faculty development and associate dean for postdoctoral affairs at Johns Hopkins University School of Medicine. She received her undergraduate degree from Brown University and her medical degree from The University of Vermont College of Medicine. After serving in the United States Navy she completed her general surgical residency at Maine Medical Center in Portland, Maine. Thereafter she worked as a commander and attending surgeon at the National Naval Medical Center in Bethesda, Maryland. Dr. Zeiger then completed a surgical oncology fellowship, focusing on endocrine surgery at the National Cancer Institute (NCI) in Bethesda, Maryland. She joined the faculty at Johns Hopkins in 1993 where she has built a busy endocrine surgery practice, established an endocrine surgery fellowship program, and directed an NIH-funded molecular biology laboratory for the past 21 yrs. Her primary research focus includes researching molecular markers associated with thyroid cancer diagnosis and prognosis.

Dr. Zeiger has held numerous leadership positions in national medical societies; the American Association of Endocrine Surgeons, American Association of Clinical Endocrinology, and the American Thyroid Association. She founded and is dean of Endocrine Surgery University, an annual course for all endocrine surgery fellows in North America. Most recently Dr. Zeiger became the associate dean for postdoctoral affairs and currently oversees 1200 postdoctoral research fellows in the School of Medicine.


Adrenal Disorders, Adrenal Surgery, Cervical Lymph Node Dissection, Endocrine Oncology, Endocrine Surgery, Endocrine Tumors, General Surgery, Goiter, Hyperparathyroidism, Hyperthyroidism, Laparoscopic Adrenal Surgery , Minimally Invasive Parathyroid Surgery, Parathyroid Surgery, Thyroid Cancer, Thyroid Nodules, Thyroid Surgery

Research Interests

Molecular markers to distinguish benign from malignant thyroid neoplasms; Signal transduction pathway abnormalities associated with thyroid malignancy

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Nancy Riess

Nancy Riess, M.B.A.


Nancy brings valuable experience in marketing, technology and product development to Johns Hopkins Medicine. She has a proven ability to analyze the marketplace, build insights and understand trends, and transform concepts into tangible results.

Most recently, Nancy Riess served as a strategic consultant to the Johns Hopkins University senior leadership team to develop business cases and executive presentations, and develop and implement new initiatives.

Previously she served as a vice president for Interactive Technologies, a strategic marketing and technology solutions firm. In this capacity, Nancy led key engagements with large corporations and several educational institutions, including JHU.

As the Director of New Business at 180s Performance Apparel, Nancy successfully launched its private label business, partnering with high profile brands including Gap, Banana Republic, Land's End, and Joseph A Bank, among others. As part of the business development effort, Nancy initiated strategic relationships with the brands, defined the product opportunity and facilitated operational implementation. Separately, her team was awarded a $40 million apparel contract for the U.S. Marine Corps.

Nancy earned her M.B.A. from U.C. Berkeley's Haas School of Business and holds a B.S. from M.I.T. in Materials Engineering.

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Ashley Fennig

Ashley Fennig

Senior Associate

Ashley Fennig brings additional financial expertise to the Business Development team in her role as Senior Associate. Her talents support a number of key areas for the team, including business logistics and planning and coordination, along with financial and analytic support. Additionally, Ms. Fennig is involved with United Way of Central Maryland, as an Emerging Leaders United (ELU) Ambassador, and a team lead for RunUnited. Ms. Fennig has previously worked at IBM, serving as senior financial consultant. Her role there focused on the complex support of the U.S. Postal Service, specifically related to network operations, finance and strategic planning as well as forecasting activities. Ms. Fennig holds a bachelor’s degree in Finance from James Madison University.

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Eli Park-Yanovitch

Eli Park-Yanovitch


Eli Park-Yanovitch joins the Business Development & Strategic Alliances team as an associate, seeking out and supporting efforts relating to health IT and other innovative technologies. Prior to joining Johns Hopkins Medicine, Mr. Park-Yanovitch worked at several prominent tech-based economic development organizations in Pittsburgh, PA, most recently developing grant proposals and building funding partnerships for Innovation Works, a leading early stage investor in high growth technology companies.

To his role as Associate, Mr. Park-Yanovitch brings expertise relating to startups and the innovation ecosystem, as well as valuable analytical and communication skills. His diverse professional background also includes event management and operations for a high-end catering company and development consulting for restaurants and nonprofits. Mr. Park-Yanovitch has a B.A. in English and History from St. Mary’s College of Maryland and an M.B.A. in Finance and Marketing from the University of Pittsburgh’s Katz Graduate School of Business.

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Laura Wortman, Associate

Laura Grant


Laura Wortman joins the Business Development & Strategic Alliances team as an Associate. Following her year-long Administrative Residency, Ms. Wortman served as an Interim Outpatient Manager at Johns Hopkins Singapore. On our team, she now supports efforts related to clinical services for large employers and corporate partnerships.  Ms. Wortman previously worked at Novation, (now Vizient) focusing on pediatric supply chain sourcing, strategic analytics and advisory activities. 

In her role as Associate, Laura brings expertise related to client relations, healthcare administration, and strategic planning. Laura holds a Masters of Health Administration from JHU Bloomberg School of Public Health and received her undergraduate degree in Political Science and International Relations from Southern Methodist University in Dallas.  Her diverse professional background also includes project management for an animation production studio.  She has participated in and led a variety of community and charitable activities in both the U.S. and overseas.

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Laurie Barksdale Administrative Coordinator

Laurie Barksdale

Administrative Coordinator

Laurie Barksdale brings an extensive administrative background to the Business Development and Strategic Alliances team. Her role as administrative secretary involves a wide range of organizational, financial, and research-related responsibilities. Her work includes the planning of executive meetings, coordinating VIP visits, financial reporting, and performing market research for the team. Ms. Barksdale began her career at Johns Hopkins Medicine in 2008 in the Radiation Oncology Department of The Sidney Kimmel Cancer Center. Her administrative contributions there were far-reaching and included involvement with the Johns Hopkins Hand Washing committee as well as an active role in the department’s United Way committee. Ms. Barksdale received her B.A. in Business Administration from Notre Dame of Maryland University.

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