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PA Entry-Level: Faculty & Staff




      Organization Charts


        Gerald T Simons MPAS, DFAAPA, PAC 

        Gerry Simons, PAC

        Jerry is a member of the PA faculty currently assigned to the Southampton campus.  His family traces it’s Hampton’s roots back to 1685. He is active in the local East End community.  After working as a critical care EMT, Jerry went on to graduate from the Stony Brook University Cardiorespiratory Science program in 1993. While at Stony Brook he played Tennis and was active in the Stony Brook Volunteer Ambulance Corps. After working as a respiratory therapist, he enrolled in the Weill Cornell Medical PA Program, where he became president of the Student Society.  After PA school he worked in both general and laproscopic surgery. In addition,  he worked part time in Urgent Care/Primary Care.  As part of his wound care training for surgery, he became certified in Undersea and Hyperbaric medicine, and he has been caring for divers with medical issues for years. Growing up on Long Island he also became interested in Tick Borne Diseases, and has treated complex patients and worked with scientific and support groups. In addition, he is a founding scientific advisor for the Stony Brook Southampton Hospital Regional Tick borne disease research center.

        Jerry is a long time member of the AAPA, and is a well-known AAPA CME lecturer. He has been identified a Subject Matter Expert in GI. He is a regular delegate to the AAPAs legislative body, the House of Delegates. Jerry has been a two time president of the American Association of Surgical PAs, and has served on their Board of Directors for nearly 20 years. Jerry directs the AASPA national wound care workshops, the Pre-PA program, and helps coordinate POCUS training.  On a state level, he has volunteered as secretary and committee chair of the NY State Society of PAs.

        Jerry has received the March of Dimes Health Career Award, the prestigious Kirklin Award for Excellence in Surgical Skills as a PA (less than 25 have been awarded in more than 40 years), is a past NY State Society of PAs Educator of the Year, and has received more than 8 university awards for academic teaching. He has received the Fireman of Year award from Springs Fire Department (East Hampton, NY).  In 2010, he was awarded the Humanitarian of the Year award by the Turn the Corner Foundation (now Global Lyme Alliance) for his dedication to the treatment of complex patients with Lyme disease. He has been interviewed by the New York Times Science Section, Redbook Magazine, Shape Magazine, and Experience Life Magazine. 

        Through the Southampton campus, Jerry coordinates the Surgery academic unit as well as the clinical rotations in Surgery.

        His wife of more than 20 years is a Robotic Surgical Nurse, his daughter is a college sophomore and former White House intern, and his son is active in his high schools robotics club.



        JIllian O'Brien, MPAS. PAC


        Professor O’Brien is a principal faculty member at Stony Brook’s Physician Assistant Program. She currently holds the title of clinical assistant professor.  In 2008, she graduated from SUNY- Cortland, Summa Cum Laude, with a bachelor of science in Athletic Training. She worked as a certified athletic trainer for several years, primarily in the high school setting.  In 2012 she graduated from the New York Institute of Technology with a Master in Physician Assistant Studies. She graduated with multiple accolades including the Alpha Eta award. After working in outpatient orthopedics immediately following graduation, she transitioned to inpatient orthopedics at NYU Winthrop Hospital. Her experience in orthopedics includes joint arthroplasty, the use of robotics in total joint arthroplasty, arthroscopic surgery, orthopedic trauma and fracture care as well as geriatric and fragility fractures. She is still a clinically active physician assistant predominantly in the field of orthopedics.

        She started her career in PA education while working alongside preceptors and helped to teach PA students during their clinical orthopedic rotation. In 2016, she began teaching clinical medicine, primarily in the topics of orthopedics and rheumatology and served as adjunct faculty at the NYIT PA program in Old Westbury. She transitioned from clinical practice to academia to become a full-time Clinical Assistant Professor at Stony Brook University in 2019. A reason for the transition includes her passion regarding the importance of teaching patient-centered care and professionalism starting when a student first sets foot inside the classroom.  

        Her teaching experiences include anatomy and physiology, clinical medicine coursework, and clinical skills labs. 

        Outside of work, Professor O’Brien enjoys spending time with her family which includes her husband and two young sons. They enjoy traveling (primarily out West), sports and many outdoor activities, especially ones where they are able to include their rescued lab-mix.


        Kristin Thomson, DHSc., PAC


        Kristin Thomson, DHSc, PAC

        Dr. Thomson is a principal faculty member at Stony Brook’s Physician Assistant Program.  She is a graduate of Quinnipiac University’s physician assistant program, and she began her medical career in 2002.  She is still a clinically active physician assistant and for over 15 years has practiced predominantly in the field of emergency medicine.

        She started her career in PA education by being a preceptor to many physician assistant students during their clinical rotations. In 2008, she began teaching physical diagnosis course work and joined the faculty of Touro College in Bay Shore, NY. While with Touro College, her role gradually expanded from part-time to a full-time faculty member, and she has served in numerous capacities as principal faculty for the program, including acting as a clinical coordinator and program director. Dr. Thomson served as the Touro College Manhattan campus program director for over five years prior to joining the Stony Brook physician assistant program in 2018.

        Dr. Thomson holds a Bachelor of Science degree from Union College, NY, a Master of Health Science degree and PA certificate from Quinnipiac University, and a Doctor of Health Science from Nova Southeastern University.  Dr. Thomson has been active on the regional and national level. She has served on PAEA committees, the editorial review board of the Journal of Allied Health Sciences and Practice, and has successfully submitted grant proposals, been a facilitator and presented posters for state, regional, and national presentations.

        Her teaching experiences include clinical medicine coursework, physical diagnosis, and health care ethics. Her academic interests include outcomes assessment, curriculum development, strategic planning, and health care leadership.

        In her spare time, Dr. Thomson enjoys traveling and spending as much time as possible with her husband and three children.


        Kelly Warren, PhD

        Kelly Warren currently holds the title of Clinical Assistant Professor in the Department of Physician Assistant Studies at Stony Brook University of New York. She received her Bachelor of Science degree from Pace University in 2003, with a focus in biology and biochemistry. Following graduation, Kelly worked for a short time as a medical research associate at Brookhaven National Laboratory within a neuroimaging laboratory. This experience peaked her interest in pursuing graduate research studies. After enrolling at Stony Brook University, Kelly went on to earn her M.S. degree in Basic Health Sciences (2006) and her Ph.D. from the Department of Physiology and Biophysics (2008).  Kelly pursued her graduate research in a neurophysiology laboratory focused on the control of breathing. Her research was aimed at evaluating the role of neurotransmission in establishing both eupnea and gasping behaviors, while also assessing the impact of psychiatric pharmacologics on respiratory symptoms associated with anxiety and panic disorders. 

        Following completion of her degree, she assumed the role of Research Instructor in Physiology and Biophysics at Stony Brook University and in 2013 was appointed as Research Assistant Professor and Director of the Master of Science Degree Program in Physiology and Biophysics. In this role, Kelly had the opportunity to work closely with the Stony Brook School of Medicine both with regards to instructional activities and also the recruitment and advising of students within the Associated Medical Schools of New York linkage program for underrepresented students in medicine. She continues to serve as a member of the Stony Brook School of Medicine Admissions Committee.

        In 2016, Kelly transitioned to the School of Health Technology and Management at Stony Brook University to provide the physiology curriculum to its students. Here, Kelly is responsible for teaching Integrative Systems Physiology (HAS331/HAD350/HAP509) for students within physician assistant, clinical laboratory sciences, and respiratory care programs. Additional teaching responsibilities include serving as course director of Exercise Physiology for Physical Therapists (HAY517) and Research Design / Evidence-Based Medicine (HAP551), while also providing lectures in additional SHTM program coursework. Kelly enjoys participating as a mentor in guiding select physician assistant students through their MS thesis research requirement. She additionally has participated as a committee member in Ph.D. research with the Health and Rehabilitation Sciences program. Within the SHTM, Kelly is currently serving as the SHTM faculty assembly secretary. 

        Select Research and Publications:

        • Abstract: Seth M, Warren K, Lamberg EM. Minimal change in metabolic activity of individuals with trans-tibial amputation following prosthesis mass alterations. American Academy of Orthotists and Prosthetists, 43rd Academy Annual Meeting and Scientific Symposium, March 2019. 
        • Abstract: Seth M, Lamberg EM, Warren K. Effect of prosthesis mass configuration on energy cost for individuals with trans-tibial amputation: case report. American Academy of Orthotists and Prosthetists, 43rd Academy Annual Meeting and Scientific Symposium, March 2017. 
        • Gandhi J, Dagur G, Warren KA, Smith NL, Zumbo A, Khan SA. The role of diabetes mellitus in sexual and reproductive health: an overview of pathogenesis, evaluation, and management. Curr Diabetes Rev, 2017 13(6):573-581. DOI: 10.2174/1573399813666161122124017
        • A.L. Negrón, M. Beymer, G. Yu, K.A. Warren, M. Acosta-Martínez. Prolonged hyperglycemia & hyperinsulinemia increases BDNF mRNA expression in the posterior ventromedial hypothalamus and the dorsomedial hypothalamus of fed female rats. Neuroscience, September 2015 Volume 303: 422-432. DOI: 10.1016/j.neuroscience.2015.07.018
        • Gautam Dagur, Kelly Warren, and Sardar Kahn. Neuro-urological Manifestations of Parkinson’s Disease. International Journal of Neuroscience. June 2016; 126(6):481-487. DOI: 10.3109/00207454.2015.1048548
        • Warren, K.A. and I.C. Solomon.  Chronic serotonin-norepinephrine reuptake transporter inhibition modifies basal respiratory output in adult mouse in vitro and in vivo. Respiratory Neurophysiology and Neurobiology, 2012 Oct 15;184(1):9-15. DOI: 10.1016/j.resp.2012.07.004
        • Warren, K.A. and I.C. Solomon.  Glutamatergic neurotransmission is not essential for, but plays a modulatory role in, the production of gasping in the arterially-perfused adult rat. Adv. Exp. Med. Biol.  2008; 605:423-427. (Special Issue entitled “Modeling and Control of Breathing: Integration in Respiratory Control: From Genes to Systems”).



        Rasheed Davis, MS, PAC

        Undergraduate: Stony Brook University: BS Health Science - Public Health Class of 2004
        Graduate: Stony Brook University: MS Physician Assistant Studies Class of 2007
        Philosophical Doctoral Student: Walden University: Health Education and Promotion

        I have been a practicing Emergency Medicine Physician Assistant for 12 years at Queens Hospital Center and five years at Mather Hospital,  Chemical Dependency and Psychiatric Physician Assistant at South Oaks Hospital for two years and Clinical Assistant Professor for seven years at Stony Brook University. During my time practicing Emergency Medicine I have served as a preceptor to many students, I have operated an urgent care center for 10-12 hours per night as a single practitioner as well as performing procedures and evaluating patients in the main emergency department. Handled an array of cases from viral syndromes, laceration repairs, reducing and splinting fractures to managing patients with ectopic pregnancies and CHF exacerbation. In addition to emergency medicine, I am a Sexual Assault Forensic Examiner for Queens County for the past for 11 years, caring for and collecting evidence from survivors of sexual assault, working with Special Victims Unit, NYPD and serving as an expert witness in court trials.

        Seven years ago, I transitioned from clinical practice to academia to become an adjunct then full-time Clinical Assistant Professor at Stony Brook University, as I realized the importance of preparation in the classroom prior to venturing out clinically. As Clinical Assistant Professor I am able to engage my students throughout 3 to 4.5 hour lecture sessions from 35 to 120 students at times.  My responsibilities included, teaching Human Anatomy & Physiology I and II, Medical Language and Human Anatomy to the Health Science undergraduates and Genito-urinary, Sexual Reproductive Health with a focus on Women’s Health, Infectious Diseases and Endocrinology to the graduate level Physician Assistant students. As a Clinical Assistant Professor I am able to incorporate my clinical experience while pursuing my PhD in Health Education and Promotion with the learning experience in the classroom, and this technique helped many students understand and apply the material as they learn.

        I have always had a heart for serving my community, women’s health, patient advocacy, providing optimal care while appreciating the positive impact I have made within a short time span during the patient encounter.


        Lisa Kayser, MS, PAC

        Director of Pre-Clinical Education