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The fellowship aims to train endourologists in enhancing the treatment of patients with complex stone disease and BPH. Throughout the fellowship year, participants will specialize in Holmium Laser Enucleation of the Prostate (HoLEP), a cutting-edge minimally invasive procedure.


Dr. Amy Krambeck instructs on the workup and medical management of stone disease. This includes extensive surgical exposure to percutaneous renal access, advanced percutaneous nephrolithotomy techniques, advanced ureteroscopy, and HoLEP.

The fellowship allocates 20% of its focus to research, guided by the faculty and leveraging the resources at Northwestern University Feinberg School of Medicine.


Upon completing the program, fellows will possess the skills to independently deliver expert-level endourological care to patients.

Fellows actively participate in weekly didactic conferences alongside the urology housestaff. These conferences include urology grand rounds, pre-operative conferences, and a fellowship-level endourology conference.

About Us


Exploring the experiences of past fellows in the Endourology – Complex Stone Disease Fellowship provides a valuable glimpse into the program's impact and the professional journey of its participants.


Perry Xu, MD

St Louis University School of Medicine

Dr. Perry Xu, MD, graduated from St. Louis University School of Medicine in 2018, marking the beginning of his journey in the field of medicine. He continued his medical education by pursuing residency training at the University of California (Irvine), where he honed his clinical skills and gained valuable experience in patient care. Following the completion of his residency in 2023, Dr. Xu sought to further specialize in endourology, a field that captivated his interest. He pursued an Endourology Fellowship at McGaw Medical Center of Northwestern University under the mentorship of Dr. Amy Krambeck, a renowned expert in the field. During this fellowship, Dr. Xu immersed himself in advanced techniques and cutting-edge research, preparing himself to become a leader in the field of endourology.


Throughout his medical education and training, Dr. Xu has demonstrated a strong commitment to excellence and a passion for advancing patient care. With his comprehensive training background and experience, he is well-equipped to provide expert care to patients with complex urological conditions. Dr. Xu's dedication to continuous learning and innovation ensures that he remains at the forefront of the latest developments in endourology, enabling him to deliver high-quality, evidence-based care to his patients. As he continues his career, Dr. Xu's contributions to the field of urology are poised to make a significant impact on patient outcomes and the advancement of medical science.


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Nicholas S. Dean, MD

University of Alberta 

Nicholas Dean, MD, is urologist currently serving at the University of Alberta. With a background in endourology, Dr. Dean completed his fellowship training under the mentorship of Dr. Amy Krambeck at Northwestern University. During his fellowship, he focused on advanced techniques such as laser enucleation of the prostate and the management of stone disease. This specialized training equipped Dr. Dean with the expertise needed to deliver high-quality care to patients with complex urological conditions.


As a urologist at the University of Alberta, Dr. Dean is dedicated to providing exceptional care to his patients while advancing the field of urology through research and education. His experience in endourology, particularly in laser techniques and stone disease management, allows him to offer patients innovative treatment options with minimally invasive approaches. Dr. Dean's commitment to excellence and his passion for urological innovation make him a valuable asset to the University of Alberta urology department and the broader medical community.

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Mark Assmus, MD

University of Calgary and Southern Alberta Institute of Urology

Mark Assmus, MD, MPH, FRCSC,  is an endourologist and certified by the Royal College of Physicians and Surgeons of Canada. He is a clinical lecturer in the Department of Surgery at the University of Calgary. Dr. Assmus received his Bachelor of Science (BSc.) with Honours in biochemistry at the University of Victoria, Victoria, British Columbia. He subsequently completed his Medical Degree (MD) with Specialized Training in Research (STIR) and urologic surgical residency at the University of Alberta in Edmonton, Alberta.

Dr. Assmus went on to complete a 2-year Master’s Degree in Public Health (MPH) focusing on health policy and management at the Richard M. Fairbanks School of Public Health: IUPUI, Indianapolis, Indiana and was inducted into the Delta Omega Honorary Society in Public Health.


Concurrently, he completed a 2-year Endourological Society fellowship at Northwestern University, Chicago, Illinois focusing on complex kidney stone management, benign prostate disease and prostate enucleation surgery with mentorship from Dr. Amy Krambeck. In 2021, he joined Northwestern as an instructor of urology in the Northwestern region of Chicago.

Dr. Assmus was then recruited to the University of Calgary and Southern Alberta Institute of Urology in 2022. Throughout his training, Dr. Assmus has been active in research in benign prostate disease, surgical technologies, kidney stone disease and quality assessment & improvement.


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Matthew Lee, MD

Ohio State University

Matthew Lee, MD, attended Yale University for his undergraduate studies and majored in Biology. He graduated cum laude.  At Yale, he was a four-year varsity athlete on the Men's Swimming and Diving team and competed in distance freestyle events.  For medical school, he attended Columbia University College of Physicians and Surgeons in New York City.  There, he was drawn to Urology because of the variety of patients that Urologists treat as well as its unique balance between surgery and medicine. Dr. Lee then matched to the University of Michigan for Urology residency. He received an excellent surgical training at University of Michigan and was inspired by his mentors to apply into Endourology for fellowship training.  He matched to the Indiana University Endourology Fellowship to train under Dr. Amy Krambeck

Dr. Lee received outstanding training in Holmium Laser Enucleation of the Prostate (HoLEP), Percutaneous Nephrolithotomy (PCNL), and Ureteroscopy from Dr. Amy Krambeck.  Dr. Krambeck was recruited to Northwestern in 2021 and Dr. Lee had to opportunity to follow and complete his fellowship at Northwestern University with her. He completed over 300 HoLEP surgeries during his fellowship and is highly experienced at performing the surgery. He published multiple papers and presented at multiple national and international conferences during his fellowship.  Dr. Lee was recruited to Ohio State University to join their faculty as an Endourologist in Sept 2022 to start the HoLEP program. He continues to perform HoLEP, PCNL, Ureteroscopy and research. He is the only fellowship trained endourologist in central Ohio to perform HoLEP.  He has performed over 500 HoLEPs so far. 



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Charles Nottingham, MD

University of Chicago

Charles Nottingham, MD, is a highly skilled urologist with a diverse educational background and extensive training in endourology. He obtained his Medical Degree from Virginia Commonwealth University School of Medicine in 2012, where he also pursued a Master of Science in Anatomy and Neurobiology, graduating in 2008. Dr. Nottingham then completed his residency in Urology at the University of Chicago Medicine in 2018, where he gained comprehensive training in the diagnosis and treatment of urological conditions. Following his residency, Dr. Nottingham pursued further specialization in endourology through a Fellowship at Indiana University-Methodist Hospital in Indianapolis, IN, under the mentorship of Dr. Amy Krambeck. During his fellowship, Dr. Nottingham developed expertise in minimally invasive surgical techniques for the management of kidney stones and other complex urological disorders.


With his extensive training and dedication to advancing patient care, Dr. Nottingham is committed to providing the highest quality of urological care to his patients. His background in anatomy and neurobiology complements his clinical skills, allowing him to approach patient care with a comprehensive understanding of the underlying anatomy and physiology. Dr. Nottingham's fellowship training in endourology has equipped him with advanced surgical skills and expertise in the latest minimally invasive techniques, enabling him to offer patients personalized treatment options tailored to their unique needs. As he continues to advance in his career, Dr. Nottingham remains dedicated to staying at the forefront of urological innovation and delivering compassionate, evidence-based care to his patients.


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Deepak Agarwal, MD

Mayo Clinic 

Dr. Deepak Agarwal serves as an Assistant Professor at the University of Minnesota, specializing in the endoscopic management of benign prostatic hyperplasia and urinary tract stones. He earned his medical degree from Indiana University School of Medicine and completed his residency in Urology at the Mayo Clinic in Rochester, MN. Following this, he pursued a fellowship at Indiana University Department of Urology, focusing on Holmium Laser Enucleation of the Prostate (HoLEP) and surgeon-guided access for percutaneous nephrolithotomy. Dr. Agarwal's clinical approach prioritizes patient choice, offering a range of treatment options for enlarged prostate and kidney stones while addressing underlying causes to prevent recurrence. Engaged in clinical research, his work aims to advance understanding and treatment in these areas.



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Tim Large, MD

Indiana University 

Tim Large, MD, is a committed surgeon whose foremost priority is the well-being and optimal outcomes of his patients. With a blend of technical precision and compassionate care, Dr. Large recognizes the trust patients place in him and approaches each case with empathy and expertise. Specializing in HoLEP (holmium laser enucleation of the prostate) and PCNL (percutaneous nephrolithotomy) surgeries, along with providing advanced endourologic care, Dr. Large dedicates himself to mastering minimally invasive procedures that enhance patient comfort and recovery. Through continual education and a steadfast pursuit of excellence, he strives to deliver the highest level of care, ensuring every patient feels respected, understood, and confident in their treatment journey.


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Blake Anderson, MD

University of Chicago

Blake B. Anderson, MD, is a  urologist practicing in Dayton and Centerville, OH, within the Dayton Physicians Network and affiliated with Premier Health Partners and Miami Valley Hospital. Dr. Anderson obtained his medical degree from Virginia Commonwealth University School of Medicine and completed his urology residency at the University of Chicago, followed by a prestigious endourology fellowship at IU Health Methodist Hospital. Specializing in minimally invasive surgery for benign prostatic hyperplasia (BPH) and renal stone disease, Dr. Anderson possesses extensive expertise in holmium laser enucleation of the prostate, complex ureteroscopy, and percutaneous renal access and nephrolithotomy. His dedication to advancing patient care through innovative surgical techniques underscores his commitment to excellence in urology.

Operation Theater

How to Apply 

All applicants must have successfully completed a five- or six-year accredited program in urology in North America. Applicants must be eligible for permanent physician licensure in the State of Illinois.


All applicants must register for the AUA Endourology Match, and complete the Endourological Society application.


To apply, email application materials listed below to Julia Sarte.

  • Endourological Society application

  • CV

  • Personal statement

  • USMLE transcripts reflecting scores for Steps 1, 2 CS, 2 CK, and 3.

  • Please request three letters of recommendation, and ask that your references email their letters to Julia Sarte. Letters emailed by applicants will not be accepted.

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