First Coast Cardiovascular Institute

Meet our team.

Our physicians and clinical teams bring together expertise in cardiovascular medicine, electrophysiology, pulmonology, sleep medicine, wound care and amputation prevention. Meet the people committed to caring for Northeast Florida.

Clinical leadership

Physicians

Select a team member to view their full professional profile.

Cardiac & Endovascular Interventions

Yazan Khatib, MD

FACC, FSCAI, FABVM, FSVM

Vaqar Ali, MD

FACC, FSCAI, FABVM

Youssef Al-Saghir, MD

FACC, FSCAI, FABVM

Mubbasher Syed, MD

MPH, FACC, FSCAI

Rabih Tabet, MD

Kelechukwu Uzoma Okoro, MD

Siva Suryadevara, MD

FACC, FSCAI

Interventional Cardiology

Sumant Lamba, MD

FACC, FSCAI

Alan Schimmel, MD

Tarek Chami, MD

Cardiovascular Disease

Ibrahim Fahdi, MD

FACC, FASE

Andrea DeNeen, MD

FACC

Ramon Castello, MD

FACC, FASE

Electrophysiology

Firas El Sabbagh, MD

FHRS

Deepak Kumar Pasupula, MD

MPH, FACC, FHRS

Sleep Medicine & Pulmonology

Irram Hamdani, MD

Daniel Thielemann, MD

Wound Care & Amputation Prevention

David Swain, DPM

CWSP

Donna Geiger, APRN

CWON

Collaborative care

Allied Health

Advanced practice providers and clinical specialists working alongside our physicians.

Advancing medicine

Research

Vanessa Hernandez

Clinical Research Manager

Practice leadership

Administration

The team supporting quality, access and day-to-day operations across the institute.

Paula Torrez

Finance Manager

Ibrahim Aloustwani

MBA, FACHE, CMPE, CPPM, CPB
Chief Executive Officer

Amy Williams

Operations & Resource Scheduling Manager

Elias Demetree

Director of Non-Clinical Operations

Michelle Banks

Operations Manager & Director of Health Informatics

Walid Abdalla

MHA, FACHE
Vice President

Daryl DeBolt

CPCS, CPMSM
Credentialing Specialist

Shelly Cataleta

Marketing Director & Physician Recruiter

Adrian Bozeman, PHR

Human Resources Coordinator

Allied Health

Marika Witkus, PA-C

NCCPA-certified Physician Assistant with a special interest in cardiology, cardiovascular physiology and collaborative patient care.

Meet Marika

Marika Witkus is a NCCPA-certified Physician Assistant and recent graduate of the University of Florida’s Physician Assistant Studies program. Originally from Massachusetts, she earned her bachelor’s degree in Biological Sciences from Smith College.

Before pursuing a career in medicine, Marika worked as a middle school science teacher, where she developed a passion for education and helping others. She later gained clinical experience as a medical assistant and scribe in vascular surgery, where she discovered how much she valued caring for patients and collaborating closely with physicians.

During PA school, Marika developed a particular interest in cardiology, drawn to the field’s complex and evolving nature as well as her interest in cardiovascular physiology. After moving to Jacksonville for her clinical rotations, she quickly fell in love with the city and its community and knew she wanted to build her career in Northeast Florida.

Marika is excited to call Northeast Florida home and begin her career with First Coast Cardiovascular Institute. Outside of medicine, she enjoys spending time outdoors with her two golden retrievers and exploring the area’s beaches.

Allied Health

Jeremy Betters, PA-C

NCCPA-certified Physician Assistant bringing 12 years of active-duty U.S. Army experience to First Coast Cardiovascular Institute.

Welcome Jeremy

First Coast Cardiovascular Institute is pleased to welcome Jeremy Betters, PA-C, to our team. A NCCPA-certified Physician Assistant, Jeremy brings 12 years of active-duty military experience to his role at FCCI.

Jeremy completed the Interservice Physician Assistant Program in 2014 while serving in the U.S. Army, earning both his Bachelor of Science and Master of Physician Assistant Studies degrees from the University of Nebraska. During his military career, he served as a Physician Assistant for 12 years.

Originally from Michigan’s Upper Peninsula, Jeremy relocated to the Orange Park area with his family following his military service. He joined First Coast Cardiovascular Institute in 2026.

Outside of work, Jeremy enjoys swimming, boating, attending Jacksonville Jaguars games, and spending time with family and friends, especially when those gatherings include good food.

The Team

Meet our team.

Cardiac & Endovascular Interventions

Yazan Khatib, MD

Vaqar Ali, MD

Youssef Al-Saghir, MD

Mubbasher Syed, MD

Rabih Tabet, MD

Kelechukwu Uzoma Okoro, MD

Siva Suryadevara, MD

Interventional Cardiology

Sumant Lamba, MD

Alan Schimmel, MD

Tarek Chami, MD

Cardiovascular Disease

Ibrahim Fahdi, MD

Andrea DeNeen, MD

Ramon Castello, MD

Electrophysiology

Firas El Sabbagh, MD

Deepak Kumar Pasupula, MD

Sleep Medicine & Pulmonology

Irram Hamdani, MD

Daniel Thielemann, MD

Wound Care & Amputation Prevention

David Swain, DPM

Donna Geiger, APRN

Lucy Walling, APRN

Sherita Bentley, APRN

Erin Voss, PA-C

Marika Witkus, PA-C

Jeremy Betters, PA-C

Cecilia Pitts, APRN

Nina Hrustic, APRN

Shephali Patel, APRN

Joseph Morgan, PA-C

Andrea Richardson, APRN

Erin Vaughan, APRN

Kortney Winkleman, APRN

Disleidys Chaviano, APRN

Lisa Stern, NP

Lindsay Richmond, APRN

Natalya Varela, APRN

Yesica Gandia Gonzalez

Sandisover Grant

Sedekah Robinson, APRN

Jason Roberts

Cheryl Preckajlo, CNMT

Vanessa Hernandez

Paula Torrez

Ibrahim Aloustwani

Amy Williams

Elias Demetree

Michelle Banks

Walid Abdalla

Daryl DeBolt

Shelly Cataleta

Adrian Bozeman, PHR

Marika Witkus, PA-C

Meet Marika

Jeremy Betters, PA-C

Welcome Jeremy

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