Gateway Executives

Tiffany Winemiller

Tiffany Winemiller has been an integral part of Gateway since 2015, when she joined as Director of Development and successfully led a multi-million campaign to expand and renovate our Stockton St. campus. Following this achievement, she transitioned to Chief Operating Officer, where she has overseen daily operations, strengthened internal systems, and helped expand services and partnerships. Her background in Hospital Administration, Development, and Operations, paired with her passion for recovery and service, uniquely positions her to build on our strong foundation and lead continued growth, innovation, and collaboration. In 2026, Tiffany was unanimously selected as President & Chief Executive Officer of Gateway by Gateway’s Board of Directors.

Dr. Raymond Pomm

Dr. Raymond Pomm is Board Certified in Psychiatry, Addiction Psychiatry, and Addiction Medicine, as well as a Certified Medical Review Officer. He has been a leader in the addiction field as it relates to the evaluation and treatment of co-occurring disorders and management of impaired professionals. He is the author for Project Save Lives, as funded by the Jacksonville City Council and has received multiple awards, including “The Marie Award” from the American Association for the Treatment of Opioid Dependence. He is an international speaker and has written multiple publications on issues surrounding addiction as well as healthcare professional impairment.

Previously, Dr. Pomm has served on the Governor’s Commission on Mental Health and Substance Abuse. In 1992, he began working for the Impaired Professionals Program of the State of Florida, the Professionals Resource Program (PRN). From 1998 until 2011 he served as Medical Director for this organization. PRN serves 29 Healthcare Boards and Councils on matters relating to healthcare professionals’ impairment. From 1994 – 2010, Dr. Pomm was an Expert Consultant to the Florida Board of Bar Examiners. He served as Medical Director for River Region Human Services from 1994 until 2017.

Dr. Pomm is a Courtesy Assistant Professor in the College of Pharmacy and Pharmaceutical Sciences at Florida Agricultural and Mechanical University as well as holding an appointment as Courtesy Associate Professor in the Department of Psychiatry at the University of Florida.

He has been a leader in the addiction field as it relates to the evaluation and treatment of co-occurring disorders and management of impaired professionals. He is the author for Project Save Lives, as funded by the Jacksonville City Council. Dr. Pomm has received multiple awards, including “The Marie Award” from the American Association for the Treatment of Opioid Dependence. He is an international speaker and has written multiple publications on issues surrounding addiction as well as healthcare professional impairment.

Jennifer VanZandt

Jennifer VanZandt serves as Chief Financial Officer at Gateway, overseeing all financial operations and strategy. She joined the organization in 2022, bringing more than 20 years of experience in accounting and financial management.

A Jacksonville native, Jennifer earned her Bachelor of Business Administration in Finance from the University of North Florida in 2002, followed by a Master’s in Accounting and Financial Management. Prior to joining Gateway, she held senior finance and accounting roles across Northeast Florida, where she built a strong track record of leadership, fiscal responsibility, and strategic planning.

Raphael Thomas

Raphael Thomas, CBC, MRSA, MRSR serves as Chief of Facilities for Gateway. He oversees the organization’s facilities department and the functioning of building systems including mechanical, electrical, and fire/life safety. He also manages projects concerning design, construction and development; supervises the maintenance of buildings, grounds and construction; equipment installation; renovation and redesigning projects.

Raphael served in the U.S. Navy for 22 years. He graduated from Liberty University with a Bachelor of Science degree and holds an Associate of Science degree in Human Services from Florida State College at Jacksonville. He is a licensed Building Contractor and Mold Assessor/Remediator.

Jennifer Faith

Jennifer J. Faith serves as Chief Human Resources Officer after joining the Gateway Team in December 2019 as Director of Human Resources. In her current role, Jennifer is responsible for leading Gateway’s overall human resources strategy, talent acquisition, employee relations, compensation and benefits, HR operations and technology.

Jennifer has brought over 20 years of diverse experience in the Human Resources field within different industries to the organization. She has a Bachelors from Brenau University.