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 Elite provider by MediFind in the treatment of Kidney Stones. His top areas of expertise are Kidney Stones, Bladder Stones, 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 a Distinguished provider by MediFind in the treatment of Kidney Stones. His top areas of expertise are Prostate Cancer, Kidney Stones, Boils, Prostatectomy, and Nephrectomy.

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 a Distinguished provider by MediFind in the treatment of Kidney Stones. His top areas of expertise are Kidney Stones, Horseshoe Kidney, Boils, Ureteroscopy, and Lithotripsy.

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 Advanced provider by MediFind in the treatment of Kidney Stones. His top areas of expertise are Prostate Cancer, Renal Cell Carcinoma (RCC), Familial Prostate Cancer, Prostatectomy, and Nephrectomy.

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 Kidney Stones. His top areas of expertise are Kidney Stones, Enlarged Prostate (BPH), UPJ Obstruction, Ureteroscopy, and Lithotripsy.

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

David Stampfer is a Urologist in Towson, Maryland. Dr. Stampfer is rated as a Distinguished provider by MediFind in the treatment of Kidney Stones. 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 a Urologist in Baltimore, Maryland. Dr. Goldstein is rated as a Distinguished provider by MediFind in the treatment of Kidney Stones. 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.

Dr. Mohamad Allaf is Professor of Urology and Oncology, as well as Director of the Department of Urology and the Brady Urological Institute and Urologist-in-Chief of the Johns Hopkins Hospital. Dr. Allaf is a world renowned surgeon-scientist having performed more than 2,000 robotic procedures and published over 250 peer reviewed research papers in the field's best journals. As one of the busiest robotic radical prostatectomy surgeons in the world, he aims to achieve the best outcomes for his patients. Having trained with Dr. Patrick Walsh, Dr. Allaf has used Dr. Walsh's method of radical prostatectomy as the basis for his own anatomic method to this complex operation. Dr. Allaf is also amongst the leaders in kidney cancer surgery, having served on the American Urological Association Guideline Committee for Kidney Cancer. He led a team who performed the rigorous analysis to help inform the most recent guidelines that was funded by the Agency for Healthcare Research and Quality (AHRQ). He is best known for his ability to save the kidney and remove the tumor in patients with kidney tumors. Dr. Allaf runs a research endeavor aiming to decrease the morbidity associated with the treatment of cancer, and he has mentored numerous leaders in academic urology. He is actively involved in fund raising for research and education, and believes in expanding our base of support in order to advance our important mission. Dr. Allaf is rated as an Experienced provider by MediFind in the treatment of Kidney Stones. His top areas of expertise are Renal Cell Carcinoma (RCC), Renal Oncocytoma, Prostate Cancer, Nephrectomy, and Prostatectomy.

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 Kidney Stones. His top areas of expertise are Enlarged Prostate (BPH), Varicocele, Hypogonadism, Nephrectomy, and Prostatectomy.

Michael Rudikoff is a primary care provider, practicing in Internal Medicine in Towson,, Maryland. Dr. Rudikoff is rated as an Experienced provider by MediFind in the treatment of Kidney Stones. His top areas of expertise are Glucocorticoid-Remediable Aldosteronism, Hypertension, Familial Hypertension, and Gastroparesis.

Kenneth Langer is a Urologist in Baltimore, Maryland. Dr. Langer is rated as an Advanced provider by MediFind in the treatment of Kidney Stones. His top areas of expertise are Enlarged Prostate (BPH), Urinary Incontinence, Frequent or Urgent Urination, Urinary Tract Infection in Children, and Ureteroscopy.

Dr. Marisa Clifton is the Director of Women’s Health at the Brady Urological Institute. She is fellowship trained. As a leader in the field of female urology, her clinical expertise includes surgical and nonsurgical treatment of pelvic organ prolapse, stress urinary incontinence, urgency urinary incontinence, urinary fistulas, genitourinary reconstruction and urethral diverticula. Dr. Clifton is also an Assistant Professor of Urology at the Johns Hopkins School of Medicine and serves as the Director of Robotic Education. In addition, she serves as Vice President of Medical Affairs at Johns Hopkins Bayview Medical Center. She also serves as Associate Chief Medical Officer of The Johns Hopkins Hospital. Her research interests include medical education and clinical outcomes after surgery. Dr. Clifton received her medical degree from the Johns Hopkins University School of Medicine and completed her residency in urology at the Mayo Clinic in Rochester, Minnesota. She completed her fellowship in Female Pelvic Medicine and Reconstructive Surgery at The Cleveland Clinic in Cleveland, Ohio. Dr. Clifton is rated as an Advanced provider by MediFind in the treatment of Kidney Stones. Her top areas of expertise are Urinary Incontinence, Obstructive Uropathy, Neurogenic Bladder, Sacral Nerve Stimulation, and Hormone Replacement Therapy (HRT).

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 an Advanced provider by MediFind in the treatment of Kidney Stones. His top areas of expertise are Urethral Stricture, Hydronephrosis, Obstructive Uropathy, Prostatectomy, and Lithotripsy.

Alan Geringer is a Urologist and an Addiction Medicine provider in Towson, Maryland. Dr. Geringer is rated as an Advanced provider by MediFind in the treatment of Kidney Stones. 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.

Christen Alevizatos is a Urologist in Baltimore, Maryland. Dr. Alevizatos is rated as an Advanced provider by MediFind in the treatment of Kidney Stones. 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 a Urologist in Baltimore, Maryland. Dr. Uberoi is rated as an Advanced provider by MediFind in the treatment of Kidney Stones. 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.

Kelly Johnson is a Urologist in Baltimore, Maryland. Dr. Johnson is rated as an Advanced provider by MediFind in the treatment of Kidney Stones. Her top areas of expertise are Urinary Incontinence, Stress Urinary Incontinence, Urinary Tract Infection in Children, and Urinary Tract Infection (UTI). Dr. Johnson is currently accepting new patients.

Ronald Tutrone is a Urologist in Baltimore, Maryland. Dr. Tutrone is rated as an Advanced provider by MediFind in the treatment of Kidney Stones. His top areas of expertise are Prostate Cancer, Enlarged Prostate (BPH), Familial Prostate Cancer, Ureteroscopy, and Prostatectomy. Dr. Tutrone is currently accepting new patients.

Daniel Dietrick is a Urologist in Towson, Maryland. Dr. Dietrick is rated as an Advanced provider by MediFind in the treatment of Kidney Stones. His top areas of expertise are Prostate Cancer, Familial Prostate Cancer, Enlarged Prostate (BPH), Ureteroscopy, and Vasectomy.