Dr. Brian Matlaga is a Professor of Urology at Johns Hopkins University School of Medicine and also is the Director of the Stephens Center for Stone Disease as well as the Executive Vice Chair of the James Buchanan Brady Urological Institute. Dr. Matlaga is an internationally recognized expert in the medical and surgical management of patients with urinary stone disease. A frequent contributor to the medical press, with over 180 peer-reviewed publications, Dr. Matlaga’s research has received national and international awards. Dr. Matlaga sits on numerous editorial boards as well as advisory committees and guidelines panels for the American Urological Association, the American Board of Urology, the Endourological Society, and the National Institutes of Health, amongst others. Dr. Matlaga serves as Executive Medical Director of Clinical Affairs for Johns Hopkins Medicine International, the arm of Johns Hopkins Medicine that manages its global presence. In this capacity, he delivers clinical care as well as project leadership across the globe. Dr. Matlaga is rated as an Advanced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Kidney Stones, Bladder Stones, Boils, Ureteroscopy, and Lithotripsy.

Naren Nimmagadda, M.D., is an assistant professor of urology at the Johns Hopkins University School of Medicine. He treats a wide range of benign and malignant urological conditions. As a fellowship trained urologist in endourologic and laparoscopic surgery, his practice focuses on treated voiding issues related to BPH through Holmium Laser Enucleation of the Prostate (HoLEP), an alternative to transurethral resection of the prostate (TURP). Dr. Nimmagadda also specializes in treating kidney, ureteral and bladder stones via shockwave lithotripsy, endoscopic and percutaneous techniques. Dr. Nimmagadda is the Endourology, Minimally Invasive Urology Fellowship Program Director. Dr. Nimmagadda attended medical school at the University of Maryland School of Medicine. Following medical school, Dr. Nimmagadda completed a general surgery internship and residency in urology at Massachusetts General Hospital. He then completed a fellowship in endourology and laparoscopic surgery at Vanderbilt University Medical Center. Following graduation, Dr. Nimmagadda served on the Vanderbilt University Medical Center’s Department of Urology faculty as an instructor. Dr. Nimmagadda has research interest in the intersection of urology and technological innovation. Dr. Nimmagadda is rated as an Advanced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Kidney Stones, Enlarged Prostate (BPH), UPJ Obstruction, Ureteroscopy, and Lithotripsy.

Peter Filderman is an Urologist in Baltimore, Maryland. Dr. Filderman is rated as a Distinguished provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Enlarged Prostate (BPH), UPJ Obstruction, Urinary Tract Infection in Children, Ureteroscopy, and Bladder Reconstruction.

Dr. Andrew J. Cohen is an Associate Professor of Urology at Johns Hopkins. He serves as the Division Director of Benign Urology and Director of Advanced Practice Providers at the Johns Hopkins Brady Urological Institute. He has a robust clinical practice focusing on complex genitourinary reconstruction. In particular, he has interest in the management of erectile dysfunction, urinary incontinence, stricture diseases of the urinary system, peyronie's disease, genital skin conditions, buried penis, urinary diversion, and other benign urologic conditions. He has extensive experience in robotic surgery. He also focuses on issues pertinent to cancer survivorship in men. He is well equipped to perform novel minimally invasive procedures such as endoscopic urethroplasty and robotic buccal ureteroplasty. He has an extensive research portfolio, with particular concentration in outcomes and safety research. Dr. Cohen received dual B.S. degrees summa cum laude from the University of Florida in Chemistry and Chemical Engineering, followed by an MD from the University of Chicago where he was inducted into the Alpha Omega Alpha Honor Society. His urologic training was pursued at the University of Chicago. Furthermore, he completed a fellowship in Genitourinary Reconstruction and Trauma at the University of California, San Francisco. Among many honors, he was invited to join the Trauma and Urologic Reconstructive Network of Surgeons in 2025. He was a also a recipient of the 'Rising Star' Award from the Society of Genitouinary Reconstructive Surgeons in 2025. Dr. Cohen is rated as a Distinguished provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Urethral Stricture, Hydronephrosis, Obstructive Uropathy, Prostatectomy, and Lithotripsy.

Alan Geringer is an Urologist and an Addiction Medicine provider in Towson, Maryland. Dr. Geringer is rated as an Advanced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Familial Prostate Cancer, Prostate Cancer, UPJ Obstruction, Ureteroscopy, and Reconstructive Urology Surgery. Dr. Geringer is currently accepting new patients.

David Stampfer is an Urologist in Towson, Maryland. Dr. Stampfer is rated as an Advanced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Enlarged Prostate (BPH), Kidney Stones, UPJ Obstruction, Ureteroscopy, and Prostatectomy. Dr. Stampfer is currently accepting new patients.

David Goldstein is an Urologist in Baltimore, Maryland. Dr. Goldstein is rated as an Advanced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Prostate Cancer, Familial Prostate Cancer, Muscle Invasive Bladder Cancer, Ureteroscopy, and Reconstructive Urology Surgery. Dr. Goldstein is currently accepting new patients.

Christen Alevizatos is an Urologist in Baltimore, Maryland. Dr. Alevizatos is rated as an Advanced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Prostate Cancer, Familial Prostate Cancer, Urinary Tract Infection in Children, Ureteroscopy, and Prostatectomy. Dr. Alevizatos is currently accepting new patients.

Vikrant Uberoi is an Urologist in Baltimore, Maryland. Dr. Uberoi is rated as an Advanced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Urinary Tract Infection (UTI), Enlarged Prostate (BPH), Urinary Tract Infection in Children, Ureteroscopy, and Bladder Reconstruction. Dr. Uberoi is currently accepting new patients.

Arun Rai, M.D., M.B.A., M.S., is a urologist who specializes in minimally invasive surgery and endourology and has extensive training to treat patients with adrenal cancer, kidney cancer, ureteral cancer and prostate cancer. In addition, he also specializes in treating patients with BPH, kidney stones and bladder stones. Dr. Rai earned both his undergraduate and medical degrees through the highly selective seven-year accelerated medical education program at Boston University School of Medicine. Dr. Rai went on to complete a general surgery internship at Baylor College of Medicine, where he then also completed his urology residency. Dr. Rai continued his training at the Northwell Health’s Smith Institute for Urology by completing a fellowship in Endourology and Minimally Invasive Surgery. During this time, he also received a dual MBA/MS in Healthcare Leadership Weill Cornell Graduate School of Medical Sciences and Cornell University. In addition to caring for patients, Dr. Rai serves as Clinical Director for the Brady Urological Institute's Quantitative Data Sciences division. His research focuses on developing the next generation of surgical technology, focusing on artificial intelligence and machine learning for optimizing clinical care. He strongly believes that surgeons should have an active role in the development of the next generation of tools for the optimal treatment of patients. He has authored several publications, with topics including patient safety in the operating room, long-term outcomes of subcapsular renal hematoma, pelvi-ureteric junction obstruction and featured in journals such as Urology and the Journal of Endourology. Dr. Rai is rated as an Experienced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Kidney Stones, Horseshoe Kidney, Boils, Ureteroscopy, and Lithotripsy.

Ahmed Ghazi is an associate professor of urology at the Johns Hopkins University School of Medicine. He is the Director of Surgical Simulation Training and the Division of Minimally Invasive and Robotic Surgery within the Johns Hopkins Brady Urological Institute. Dr. Ghazi specializes in urologic surgical oncology using the latest techniques of minimally invasive surgery for prostate, kidney, bladder, ureteral and other genitourinary organ cancers. He also as specializes in minimal invasive treatment of complex stones of the urinary tract. Dr. Ghazi is a pioneer in the field of patient-specific surgical simulation, which has applications for training future surgeons as well as improving outcomes for patients through individualized modeling. When planning for a complex surgery, Dr. Ghazi constructs 3D models of the patient’s anatomy in order to plan and rehearse surgery prior to the actual surgery. These models span from digital renderings to tangible models used to practice the critical components of your surgery. Dr. Ghazi received his medical degree from Cairo University in Egypt in 2000, where he also completed his surgery training and urology residency. From there, Dr. Ghazi completed a laparoscopic fellowship in Paris, France in 2008, followed by a second laparoscopic fellowship in Austria in 2009. While practicing in Europe, Dr. Ghazi was accepted to the European Board of Urology. Dr. Ghazi continued his training at the University of Rochester, New York through a two-year fellowship in the robotic treatment of various urologic cancers. He then joined the staff at the urology department of University of Rochester in 2012 where he continued to practice until joining Johns Hopkins Medicine. Dr. Ghazi believes in a reciprocal relationship between innovation, surgery & research where each informs and strengthens the others. He strives to adopt innovative surgical technologies that are evidence-based, benefit his patients and translate directly to improved patient outcomes. Dr. Ghazi is rated as an Experienced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Prostate Cancer, Kidney Stones, Boils, Prostatectomy, and Nephrectomy.

Arvin K. George, MD, is a urologic surgeon specializing in the diagnosis and management of genitourinary cancers, with particular sub-specialization in kidney and prostate cancers. His clinical interests and expertise are in image-guided therapeutics, and minimally-invasive ablative/surgical techniques for prostate and kidney cancer. These include laparoscopic and robotic surgery, in addition to cryoablation, high-intensity focused ultrasound ablation, nanoparticle directed laser ablation, laser interstitial thermal therapy, and bipolar radiofrequency ablation. Dr. George obtained his medical degree from the Royal College of Surgeons in Ireland, followed by a urology residency at the Smith Institute for Urology, Hofstra North Shore-LIJ School of Medicine. He remained to complete his endourology/minimally-invasive and robotic surgery fellowship in New York gaining additional subspecialty expertise in robotic, laparoscopic, and percutaneous surgery. Subsequently, he completed a urologic oncology fellowship at the National Cancer Institute, National Institutes of Health. He then joined the clinical facility at the University of Michigan, Ann Arbor, where he directed the Prostate Cancer Programs from 2019 through 2023. Dr. George participates extensively in the discovery of urologic science and evaluation of urologic care and has co-authored over 80 peer reviewed publications. Additionally, he has authored 11 chapters in medical education books. Dr. George sees patients in clinic throughout the Baltimore region and also is available for virtual appointments for patients in Maryland, Washington D.C., New York and Michigan. Dr. George is rated as an Experienced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Prostate Cancer, Renal Cell Carcinoma (RCC), Familial Prostate Cancer, Prostatectomy, and Nephrectomy.

Nirmish Singla is an Oncologist in Lutherville, Maryland. Dr. Singla is rated as an Experienced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Upper Tract Urothelial Carcinoma (UTUC), Renal Cell Carcinoma (RCC), Urothelial Cancer, Nephrectomy, and Orchiectomy.

Dr. Herati is a urologist with fellowship training in male infertility and andrology. He has specialized training to perform complex reconstructions of the reproductive system, including vasectomy reversal with vasovasostomy and vasoepididymostomy. Additionally, he has an interest in treating patients with chronic prostatitis and pelvic pain, as well as patients experiencing low testosterone, erectile dysfunction, Peyronie’s disease and benign prostatic hyperplasia (BPH). Of note, he has the ability to perform fertility treatments on patients who have experienced spinal cord injuries using nonsurgical methods of sperm extraction. Dr. Herati believes in an individualized approach to care that addresses the whole patient. He invests significant time into building a rapport with his patients so that they feel comfortable opening up about these issues, allowing him to accurately identify and manage each patient’s needs. His research interests include decoding the genetic basis of male infertility, investigating the impact of referred pain from peripheral nerves to the bladder, and characterizing the effects of low testosterone on prostate inflammation and PSA screening. Dr. Herati sees patients at both the Johns Hopkins Hospital and The Johns Hopkins Bayview Medical Center. Videos Amin Herati, M.D.Urologist. Dr. Herati is rated as an Experienced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Enlarged Prostate (BPH), Varicocele, Hypogonadism, Nephrectomy, and Prostatectomy.

Brian Neuman is an Urologist in Baltimore, Maryland. Dr. Neuman is rated as an Advanced provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Frequent or Urgent Urination, Enlarged Prostate (BPH), UPJ Obstruction, Urethral Stricture, and Ureteroscopy. Dr. Neuman is currently accepting new patients.

Mark Shimko is an Urologist in Baltimore, Maryland. Dr. Shimko is rated as a Distinguished provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Prostate Cancer, Familial Prostate Cancer, UPJ Obstruction, Nephrectomy, and Reconstructive Urology Surgery. Dr. Shimko is currently accepting new patients.

David Sigman is an Urologist in Baltimore, Maryland. Dr. Sigman is rated as a Distinguished provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Enlarged Prostate (BPH), Urinary Tract Infection in Children, Urinary Tract Infection (UTI), Ureteroscopy, and Prostatectomy. Dr. Sigman is currently accepting new patients.

Steven Jaskulsky is an Urologist in Baltimore, Maryland. Dr. Jaskulsky is rated as a Distinguished provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Scrotal Swelling, Testicle Lump, Scrotal Masses, and Enlarged Prostate (BPH). Dr. Jaskulsky is currently accepting new patients.

Jonathan Rubenstein is an Urologist in Baltimore, Maryland. Dr. Rubenstein is rated as a Distinguished provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Perirenal Abscess, Carbuncle, Folliculitis, Ureteroscopy, and Nephrectomy. Dr. Rubenstein is currently accepting new patients.

Jayant Uberoi is an Urologist in Baltimore, Maryland. Dr. Uberoi is rated as a Distinguished provider by MediFind in the treatment of UPJ Obstruction. His top areas of expertise are Horseshoe Kidney, UPJ Obstruction, Enlarged Prostate (BPH), Ureteroscopy, and Prostatectomy. Dr. Uberoi is currently accepting new patients.