Leonard S. Marks, MD

Leonard S. Marks, MD

Professor and deKernion Endowed Chair in Urology, Dr. Marks received his medical degree from the University of Texas, graduating with AOA honors and a Masters of Arts in Physiology in 1969. 

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MRI/Ultrasound Fusion for Prostate Biopsy

Dr. Wayne Brisbane

Wayne Brisbane, MD

Dr. Brisbane obtained his medical degree from Loma Linda University School of Medicine in California.  He completed a residency in Urology at the University of Washington.  His research at the University of Washington included work at the Center for Industrial and Medical Ultrasound where he studied novel ablative therapy for kidney cancer using focused ultrasound. Starting in July of 2019 Dr. Brisbane began a two-year fellowship in Urologic Oncology at UCLA.

Merdie K. Delfin, NP

Merdie K. Delfin, NP

Nurse Practitioner

Merdie Delfin is a nurse practitioner and research coordinator who joined Dr. Marks's research team in 2016.  She graduated from Loyola Marymount University with a Bachelor's Degree in Psychology and a minor in Biology.  She then went on to obtain her nursing license and graduated with a Master's Degree in Nursing from the University of San Francisco. 


Kyle Crisostomo, LVN

Fusion Biopsy Operator

Kyle von Crisostomo is a Licensed Vocational Nurse who has been working with UCLA’s Clark Urology Department since 2018. He is currently a part of Dr. Leonard S. Marks’ multi-disciplinary team, which is focused primarily on low to intermediate risk prostate cancer. Kyle holds a certification in the operation of the Artemis fusion device and is currently assisting as the main clinical nurse and fusion biopsy operator for the patient care under Dr. Marks’ practice.

Rory Geoghegan

Rory Geoghegan, PhD

Project Scientist

Dr. Geoghegan obtained a bachelor's degree in Mechanical Engineering from University College Dublin (Ireland), a master’s degree in Biomedical Engineering from Imperial College London (U.K.) and a doctorate in Bionengineering from University of California, Los Angeles. His primary research interest is the development of minimally invasive surgical technology

Samantha Gonzalez

Samantha Gonzalez, MA

Database Manager

Ms. Gonzalez joined the UCLA Institute of Urologic Oncology in 2021. She received her Bachelor’s degree from UCLA in Anthropology & Egyptology and her Master’s degree from Missouri State University in History. She is currently assisting Dr. Leonard S. Marks’s prostate cancer research studies, including active surveillance and low to intermediate-risk prostate cancer treatment. Ms. Gonzalez holds a strong passion for patient care and research.

Jake Pensa

Jake Pensa, MS

UCLA PhD Candidate

Jake Pensa is an engineering graduate student in the Henry Samueli School of Engineering and Applied Sciences at UCLA. His research is focused on multi-modality image registration and analysis for prostate cancer detection and treatment. Prior to pursuing a doctoral degree, he obtained B.S. and M.S. degrees from UCLA in bioengineering while working on system development of

Elizabeth Tran

Elizabeth Tran

Study Coordinator

A clinical research coordinator with the UCLA Institute of Urologic Oncology, Ms. Elizabeth (Eli) Tran joined the team in the Summer of 2019, after graduating with a Bachelor’s degree at UCLA.  She is currently assisting Dr. Leonard S. Marks’s prostate cancer research studies, which focus primarily on diagnosis, active surveillance, and treatment of low to intermediate risk prostate cancer.