Giora Weisz, MD

With an office conveniently located in Cortlandt Manor, NY, our board-certified urologists provide comprehensive and compassionate services for all our patients – men, women and children. We care for urinary tract problems, like a leaky bladder. Optum urologists also care for the male reproductive system. Our patients come first and we treat every individual as if they were a member of our own family. Optum accepts most major health plans.

Brian Lorenzen, FNP, is a specialized provider in orthopedics, serving patients in Cortlandt Manor, NY, and Jefferson Valley. With a focus on delivering quality care, he is part of a network that includes various services such as urgent care, primary care, and pediatrics. Educated at Pace University, Brian Lorenzen holds a Master’s degree in Family Nurse Practitioner and is committed to patient satisfaction, as reflected in the positive ratings from those who have visited him. He is currently accepting new patients and is dedicated to providing comprehensive medical care in a supportive environment. Generated from the website

Mariya Kobi, MD, is a board-certified radiologist specializing in body imaging. She is an assistant professor of radiology at Columbia University Irving Medical Center and an assistant attending radiologist at NewYork-Presbyterian Hospital. Dr. Kobi earned her MD from Albert Einstein College of Medicine. After an internship year in internal medicine at Beth Israel Medical Center in New York, she completed her residency training at Montefiore Medical Center, where she served as chief resident. She then completed an Abdominal Imaging Fellowship, also at Montefiore Medical Center. Her clinical expertise is in multimodality abdominal imaging with a focus on gastrointestinal and genitourinary conditions. She interprets a wide range of imaging examinations including CT scan, MRI, ultrasound, and radiography. Her clinical interests are pre- and post-operative imaging of liver, kidney, and pancreas transplants and virtual colonoscopy. She has had numerous original research articles published, along with contributions to reviews and book chapters, and has given many oral presentations nationally, including at the Society of Abdominal Radiology annual meeting. She is a member of American College of Radiology (ACR), the Society of Abdominal Radiology (SAR), American Roentgen Ray Society (ARRS), and the Radiological Society of North America (RSNA). She serves on ACR quality improvement committees including the Expert Panel on GI Imaging and CT Colonography. See a full list of Dr. Kobi's publications.