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Division of Urologic Surgery

The Saint Louis University School of Medicine’s Division of Urologic Surgery is proud to serve the needs of our students, residents and fellow University faculty and honored to address the urologic needs of our patients.

Our division possesses expertise in the major urologic subspecialties including oncology, robotics, reconstructive surgery, stone disease, female urology and pediatrics.


Our clinical faculty is made up of outstanding individuals who are committed to teaching the next generation of surgeons with state-of-the-art medicine while delivering compassionate care to each of our patients.

Our urology faculty comprises six full-time and several adjunct faculty members, three mid-level practitioners, clinical nurses, and administrative staff members. All provide clinical services at SSM Health Saint Louis University Hospital, SSM Health Cardinal Glennon Children’s Hospital and SSM Health St. Mary's Hospital.

  • Sameer Siddiqui, M.D.
    Professor, Department Chair
  • Barry P. Duel, M.D., FAAP, FACS
    Associate Professor 
  • Zachary Hamilton, M.D. 
    Associate Professor, Division Chief
  • Lindsay Lombardo, D.O.
    Assistant Professor
  • R. Clay McDonough, M.D.
    Assistant Professor 
  • Timothy Phillips, M.D.
    Assistant Professor

Residency Program Overview

The aim of the Saint Louis University Urology Residency Program is to provide a comprehensive educational experience that encompasses all aspects of clinical urology and research. Our program involves one year of general surgery and four clinical years of urology training, as well as weekly didactic teaching sessions. As residents progress through training, they will be given increased clinical and surgical responsibilities. We promote an environment of mentorship and teamwork between attending surgeons and residents.

We currently accept one resident position each year through the urology match. Applicants should register with the American Urological Association's Urology Residency Matching Program and the Society of Academic Urology. 

Download Saint Louis University Department of Urology Resident Handbook

Rotation Locations

  • SSM Health Saint Louis University Hospital
  • SSM Health Cardinal Glennon Children's Hospital
  • SSM Health St. Mary's Health Center

Current Residents 

Leor Arbel, M.D.

Leor Arbel, M.D.

Medical School: University of Central Florida, College of Medicine

Joshua Trierweiler, M.D.

Joshua Trierweiler, M.D.

Medical School: Saint Louis University School of Medicine

Jeffrey Orf, M.D.

Jeffrey Orf, M.D.

Medical School: Creighton University School of Medicine

Ryan Wong, M.D.

Ryan Wong, M.D.

Medical School: Saint Louis University School of Medicine

Aaron Baer, M.D.

Aaron Baer, M.D. 

Medical School: University of Tennessee Health Science Center College of Medicine


Conference and Lecture Series 

The program director is responsible for designing the curriculum as specified by Accreditation Council for Graduate Medical Education (ACGME) for resident education. Each faculty member is assigned particular components of resident education throughout the year. The didactic component is conducted every week on Wednesdays between 7 and 9 a.m.

The first and third Wednesdays of the month are dedicated to the Genitourinary Oncology Multidisciplinary Conference. The second and fourth Wednesdays consist of a teaching conference following the American Urological Association Core Curriculum, with faculty resident and invited speakers. Morbidity and Mortality Conference is held on the fourth Wednesday. In months with a fifth Wednesday (quarterly), Journal Club is held. Conference details are below:

Resident Handbook

Morbidity and Mortality 

The residents assigned to each institution present all cases resulting in death or with a complication. We follow the Clavien-Dindo grading system, and residents are expected to prepare a few slides discussing system improvements that may assist in enhancing patient safety, care and outcomes.

Journal Club

Three to four articles are chosen by a rotating faculty member and distributed to residents at least one week in advance. Each resident and faculty member is expected to read all articles. During conference, each resident will be called on to present one of the articles with emphasis on study concepts, design, results and importance of the article in the urological world. Faculty are also expected to read all articles prior to Journal Club and have active participation.

Core Curriculum Conference 

On a rotating basis, faculty are expected to present a didactic lecture on a urologic topic. The lecture series is a two-year cycle of lectures based on the American Urological Association online core curriculum. Guest lecturers from other services (such as nephrology or radiology) will also provide instruction. Conference consists of a lecture approximately one hour in length, followed by review of relevant self-assessment test questions to be discussed in a group format. Occasionally, this time slot will also include lectures on medical ethics, bio-statistics and research presentations.

Genitourinary Multidisciplinary Conferences 
 Residents will also be expected to attend genitourinary multidisciplinary conference (first and third Wednesdays at SSM Health Saint Louis University Hospital) where complex oncology cases are presented with radiation oncologists, medical oncologists and pathologists. A resident will be assigned to add patients to the conference schedule. Presentations of cases at the conference will vary based on which specialty the patient originally presented. On the first Wednesday of every month there is a pediatric nephrology/urology/radiology conference at SSM Health Cardinal Glennon Children's Hospital, and the resident rotating on pediatric urology will attend this instead.
Pediatric Nephrology/ Urology/ Radiology Conference 
This multidisciplinary conference takes place in the radiology conference room at SSM Health Cardinal Glennon Children’s Hospital at 7:15 a.m. on the first Wednesday of every month. The resident rotating at Cardinal Glennon attends this conference and presents relevant patients.

Resident Health and Wellness

We take the wellbeing of our residents very seriously, and encourage a healthy work/life balance during training and as you enter your career. In addition to regular training regarding the recognition of fatigue, burnout, mental illness and substance abuse, there are many resources available should you need help.

For residents who feel they need help, but are not comfortable discussing it with faculty or fellow residents, Saint Louis University has a free, confidential Employee Assistance Program (EAP), which can be accessed 24-hours-a-day, every day of the year at 800-859-9319.