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Meet Our Radiologists

Our doctors come from varied backgrounds, but have common characteristics. They have received the finest training in the United States, and many hold advanced certifications. They are all board certified by the American Board of Radiology, and they all participate in extensive continuing education activities. Their goal is to provide you the finest possible care.

Brian Murphy, MD has been with L&M Radiology since completing his radiology residency training at Baystate Medical Center, Springfield, MA in 1992. He currently serves as the President of the practice, the Chief of Radiology at Lawrence General Hospital and the Medical Director for Women's Health Imaging Suite in Andover. Dr. Murphy lives in North Andover with his wife and three children.

Larry Casha, MD graduated from New York Medical College in 1991. He completed his residency at Madigan Army Medical Center and attained the rank of Major in the Army. He was a fellow in interventional radiology at MGH prior to joining L&M Radiology in 2002. He is leader of the Interventional Section of L&M Radiology. Dr. Casha lives in Andover with his wife and two daughters. He is an avid bicyclist in his spare time.

Stewart Hou, MD graduated from MIT in Cambridge, and was a resident in Diagnostic Radiology at the New York-Presbyterian Hospital in NYC from 1997 to 2001. He worked at Quincy Medical Center for 5 years before joining L&M Radiology in 2006. Outside of work he is a competitive ballroom dancer. 

Ellen Johnson, MD has a chemistry degree from Bucknell University and worked for 10 years in basic science cancer research in Hanover, NH, prior to attending Dartmouth Medical School.  She complete her internship and residency at Dartmouth Hitchcock Medical Center where she focused her research on new breast cancer imaging technologies.  After 10 years of practice in NH, Dr. Johnson came to L&M Radiology in 2011.  She brings with her a strong background in Women's Imaging and is known for her warm, empathic style among her patients.  She lives in North Andover with her husband and enjoys outdoor sports in her spare time.

Zina Matlyuk, MD
received her medical degree from the Penn State College of Medicine and completed both her radiology residency and fellowship training in musculoskeletal imaging at Penn State Milton S. Hershey Medical Center.  She is a board-certified radiologist. Prior to joining L&M Radiology in 2010, she was Assistant Professor of Radiology and Director of Musculoskeletal Imaging at the University of Connecticut Medical Center. She and her husband live outside of Boston. In her spare time, she enjoys reading, sculpting, and drawing.

James Meyer, MD graduated from Tufts Medical School in 2001 and completed his radiology residency there in 2006. He was an interventional radiology fellow at Brigham and Women's Hospital prior to joining L&M Radiology. His special interests include treating peripheral arterial and venous disease, uterine fibroid embolization, dialysis access management and vertebroplasty. He lives in Gloucester with his wife and three children.

Christian Nguyen, MD attended the University of Minnesota for college, medical school and residency. He then completed a fellowship in cross-sectional imagining at the Mayo Clinic in Rochester, Minnesota. He came to L&M Radiology in 2007 after working in Seattle for several years. He lives with his wife in North Andover, and enjoys exercise, urban activities and travel in his spare time.

Ali Niakosari, MD graduated from the Tehran University of Medical Sciences in 1993, after which he practiced general medicine in Iran for four years. He then came to the US and completed his radiology residency at Albert Einstein Medical College in 2002. He completed a fellowship in body imaging at Thomas Jefferson Medical School in 2003 and was then a neuroradiology fellow at Yale New Haven Hospital in 2004. He was an assistant professor at Yale before joining L&M in 2006. He lives in Andover with his wife and daughter. He enjoys travel and spending time with his family.

David Novick, MD was a resident at the Massachusetts General Hospital from 1983 through 1986 and was a fellow there in vascular and interventional radiology from 1986-1987. He has earned advanced certification in interventional radiology. He joined L&M radiology in 1987 and has been on the staff at LGH since then. Dr. Novick deepened his skills in MRI at Shields Healthcare from May 2002 to November 2003 before returning to L&M radiology. Dr. Novick has also been on the medical staff at the Isham Infirmary at Phillips Andover Academy since 1994. Dr. Novick lives with his wife and two sons in Andover. His interests include skiing, tennis and squash, and has been active as a coach in local youth baseball for many years.

Mark Rieumont, MD is a native New Yorker. He has his B.S. in Biochemistry from SUNY Stonybrook and his MD degree from SUNY Downstate. He was both a radiology resident and dual fellow in MRI and interventional radiology at Massachusetts General Hospital. After several years on staff at MGH, Dr. Rieumont entered private practice. Dr. Rieumont lives locally with his wife and two children.

Linda Salzman, MD is a graduate of Barnard College, and attended Cornell Medical College. She completed her residency and a fellowship in ultrasound and CT at Boston City Hospital/ BU Medical Center. She was on staff for several years at Lahey Clinic, and then at Deaconess-Waltham Hospital where she was chief of radiology. She is currently Chief of Radiology at Merrimack Valley Hospital. Her interests include CT, MRI and minimally invasive breast biopsies. She lives in Andover with her husband and three daughters, and enjoys playing tennis and bicycling with her family.

Lori Weir, MD was a resident in Diagnostic Radiology at St. Lukes-Roosevelt Hospital (Columbia University) in New York City from 2002-2004, and then an interventional radiology fellow at INOVA-Alexandria Hospital in Alexandria, VA from 2004-2005. After several years at a large tertiary care practice in Dallas, TX , she came to L&M Radiology in 2009. She lives with her spouse and son in North Andover, and in her spare time she enjoys running, rock climbing and reading.

Arthur Zerbey, MD was a resident in diagnostic radiology at Lahey Clinic in Burlington from 1989 to 1993, and was an interventional radiology fellow at the Massachusetts General Hospital from 1993 to 1995. He earned advanced certification in interventional radiology. After a number of years at Holy Family Hospital in Methuen, he came to L&M Radiology in 2006. He has recently returned with L&M Radiology to Holy Family Hospital where he is Chief of Radiology. He lives with his wife and two daughters in North Andover and is a recreational pilot in his spare time.

Mara Kunst, MD attended Georgetown University for both college and medical School before moving to Boston in 2004. She completed her residency at Beth Israel Deaconess Medical Center and a Neuroradiology fellowship at Massachusetts General Hospital. She holds board certifications in both General Radiology and Neuroradiology. Prior to joining L&M Radiology in 2010 she was an Instructor in Radiology at Harvard Medical School. She lives in Winchester with her family, and enjoys the outdoors and traveling in her spare time.

Dipti Lenhart, MD graduated from Harvard College and went to New York University for medical school and radiology residency. After completing her training in Diagnostic Radiology, she was a fellow at Massachusetts General Hospital specializing in Abdominal Imaging. Dr. Lenhart joined L&M Radiology in 2010. She and her husband live in Boston.

Timothy Norton, MD graduated from the University of Notre Dame and completed medical school at the University of Illinois. He served in the Air Force as a Flight Surgeon for four years, based out of South Korea and then Las Vegas. He entered radiology residency training in Hartford, CT, and then completed his Interventional Radiology fellowship training at Massachusetts General Hospital. He and his wife have four children and live in North Andover.

Imaging: BICE

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