Our Executive Leadership Team is responsible for the day-to-day guidance of Public Health Solutions (PHS). They are also highly committed to inspire PHS’ passionate and talented staff to learn more, do more, and become more.

Lisa David

President and CEO

Lisa David is the President and CEO of PHS. She leads the organization to support vulnerable families in achieving optimal health and building pathways to reach their potential. Under Lisa’s guidance, PHS improves health outcomes among underserved families by providing direct services such as food assistance, health insurance enrollment, maternal and child health support and sexual and reproductive health services, delivering robust fiscal and administrative grant support for over 200 community-based organizations across the city, and developing coordinated and accountable networks that bridge health and human services to make a sustainable impact in community health.

Lisa has over 30 years of experience in the public health and healthcare sectors. Prior to joining PHS, she held positions as the Interim CEO of Medicines360, the EVP and COO of Planned Parenthood Federation of America, and the Vice Chair for Administration of the Department of Obstetrics and Gynecology at the Columbia School of Physicians and Surgeons. Lisa currently serves on the Health and Mental Hygiene Advisory Council and the Health and Mental Health Advisory Committee for the New York City Department of Health and Mental Hygiene, the Policy Committee of the United Hospital Fund, the Priority and Strategy Council of the Human Services Council, and the New York City Mayor’s Public Health Advisory Council. She also serves on the board of directors of Medicines360, the board of trustees of the Women’s Health Activist Movement Global (WHAMglobal), and the board of National Network of Public Health Institutes (NNPHI).

Kathy Fitzpatrick

Chief Financial Officer

Kathy Fitzpatrick assumed the role of Chief Financial Officer for PHS in July 2019. Kathy joined PHS 35 years ago, and quickly accumulated more responsibilities. She eventually took full charge of all fiscal functions as Corporate Controller during years of great expansion for PHS. Kathy is responsible for establishing many of the processes and procedures the organization follows. As such, she is the ‘go to’ source for questions, and with her institutional memory, she is an unparalleled resource. She knows just about everything about PHS, and always helps us all get a handle on a new project or initiative. She will continue to provide guidance and direction on all of our most difficult accounting issues in her new role.

She has been an integral part of our organization for those 35 years, helping to steward PHS’ resources through rapid growth and change.

Zachariah “Zach” Hennessey

Executive Vice President and Chief Strategy Officer

Zach Hennessey joined PHS in 2017 as Vice President of Neighborhood Health to lead PHS’ community work — including development, quality and evaluation, budget setting, knowledge management, and all internal and external relationship management.  In 2021 he was named Executive Vice President and Chief Strategy Officer to lead PHS’ innovative work to develop trustworthy and reliable pathways between healthcare systems, managed care organizations and community resources that advance health equity.  In this role he is responsible for developing strategic partnerships across sectors and deploying innovative uses of technology to build community resilience in the wake of COVID-19.

Zach is a health and human services leader with more than 15 years’ experience partnering with NYC communities to advocate for just policies, secure critical resources, leverage innovation, and create opportunities that advance health and health equity. Prior to PHS, he served as Assistant Vice President for Community and Population Health at Wyckoff Heights Medical Center and co-directed the Special Projects Division of the Spencer Cox Center for Health at St. Luke’s-Roosevelt Hospital Center, New York’s largest Designated AIDS Center. In these hospital leadership positions, he he worked to build community partnerships and preventive services into clinical care. Zach has also served as a consultant to a broad range of community-based organizations. He leads the NYC COVID-19 Rapid Response Coalition, serves on the Board of the Ridgewood, Queens YMCA, and previously served on the Mayor’s HIV Planning Council and the New York State LGBT Health and Human Services Network. He holds a Masters in Developmental Psychology from Teacher’s College, Columbia University, and was a Johnson & Johnson Undergraduate Research Fellow and Henry Rutgers Scholar at Rutgers College.

Peter Jensen


Chief Information Officer

Peter Jensen joined Public Health Solutions in 2001 and has been the Chief Information Officer since 2007.  As CIO Peter overseas all corporate technology and communication systems. Peter has 30 years’ experience supporting numerous technology initiative in the public health and education fields. Prior to joining Public Health Solutions, he worked as the Content Manager for the Center for Collaborative Education which project supported 40 New York City Public Schools with educational technology. He has also worked at the Dalton School as the Associate Director of Technology.

Krista Lepper

Vice President of Legal Affairs and General Counsel

Krista Lepper first came to PHS as a Post-Graduate Legal Fellow, straight from Brooklyn Law School in 2009. After working through a variety of legal roles at PHS, Krista was promoted to General Counsel and Vice President of Legal Affairs. In this new role, she provides counsel to the Senior Leadership Team, Board, and staff; addresses nonprofit governance and ethical issues; oversees PHS’ contracting and compliance work; and engages in and supports employee relations. Over the past ten years at PHS, Krista has completely revamped PHS’ HIPAA program, engaged with numerous outside counsel on myriad contracting and other transactional issues and, most importantly, gotten to know her PHS colleagues. Krista has always had an interest in public health, working at Kaiser Permanent’s Division of Research prior to attending law school. Access to healthcare and health equity are two issues she and PHS are committed to fighting for.

Deidre Sully

Senior Director for Health Policy and Community Affairs

Deidre Sully first joined PHS in 2010 as a Borough Coordinator with NYC Smoke-Free, then named NYC Coalition for a Smoke-Free City. Now, as Senior Director for Health Policy and Community Affairs, she aims to further advance the organization’s work in community outreach, health advocacy and influence on public health policy.

Deidre continues to direct PHS’ advocacy program, NYC Smoke-Free, leading the program’s mission to expand smoke-free protections for New York City. As Director, Deidre develops messaging, sets budgets and provides overall strategic direction for the team. Prior to joining PHS, Ms. Sully worked in cancer research at Memorial Sloan-Kettering Cancer Center, where she managed a multi-center Gastric Cancer Consortium. Adding to her experience in public health, Ms. Sully also volunteers for Red Wrap, a community service initiative providing feminine hygiene products to displaced women and girls. Recently, Deidre also added the role of Health Influencer as the founder of True Health Live, a podcast exploring basic truths of public health issues in the world and building upon the importance of people being able to make informed decisions about their health.

Deidre received her MPH from Boston University. Her passion is to apply her skills and knowledge help people achieve and maintain optimal levels of health through information, advocacy and policy.