Current Renal Fellows

First-Year Fellows 

Natalie Beck​, MD

Hometown:  Oregon City, OR

Medical School:  Oregon Health & Sciences University

Residency:  University of Colorado Internal Medicine Residency

Research/Clinical Interests:  I am interested in medical education as well as clinical research (though currently undifferentiated)

Hobbies:  I enjoy hiking/backpacking, going on road trips to visit National Parks with my boyfriend, snowshoeing, gardening, cooking dinner for friends, baking, and visiting some of the many breweries in the Denver area. 

Why did you choose the University of Colorado?  As a resident here I went through a renal elective and was very impressed with the education I received both from fellows/faculty and the educational conferences offered for the fellows. I felt that the variety of patients in each hospital we rotate through would allow me to be exposed to everything.  Denver has also been a great city in which to live with many opportunities for my outdoor hobbies.


Ruth Campbell, DO

Hometown: Colorado Springs, CO

Medical School: Rocky Vista University CO

Residency:  MercyOne Medical Center, Des Moines

Research/Clinical Interests:  Everything! But specifically, I’m interested in glomerulonephritis and AKI. I enjoy teaching, and working with medical students and residents. 

Hobbies:  I like rock climbing, hiking, and skiing with my husband Matt and our pup, Frisbee. And eating tacos afterwards.

Why did you choose the University of Colorado?  University of Colorado was number one on my list because it is a top-ranked program with excellent faculty who are committed to both education and research. Plus, the fellows are incredibly supportive of each other.



Shrey Purohit, MD

Purohit, Shrey

Hometown:  Los Angeles, CA

Medical School: University of Michigan Medical School

Residency:  Duke University

Research/Clinical Interests:  Long term outcomes for CKD in younger populations, inherited kidney diseases, immunology

Hobbies:  reading, cooking, building computers

Why did you choose the University of Colorado? University of Colorado provided me with the opportunity to create my own clinical pathway and explore my research interests. The faculty are extremely collegial and strongly invested in their fellows. Denver is also a great city to explore and has something for everyone!


Katherine RizzoloRizzolo, Katherine MD​, MD

Hometown:  Franklin, MA

Medical School:  Tufts University - Boston, MA

Residency:   Maine Medical Center - Portland, ME

Research/Clinical Interests:   Immigrant health/access to dialysis for undocumented immigrants, healthcare disparities in nephrology, resident/trainee wellness

Hobbies:  Long distance running, skiing, knitting, international travel, yoga, craft beer, gummy bears

Why did you choose the University of Colorado?  Fantastic research on and advocacy for, health inequalities and social justice.  Promotion of fellow wellness within the program.


Tritia Schostak, DOSchostak, Tritia  DO

Hometown: Lake Forest, California

Medical School:  Touro University Nevada

Residency:  MountainView Hospital - Sunrise Health

Research/Clinical Interests:  Electrolyte disorders, renal replacement therapies

Hobbies:  Plants (despite not having the greenest thumb), tennis, basketball, eating, exploring new places

Why did you choose the University of Colorado? Quality of training, supportive faculty and their focus on fellows’ well-being as well as the amazing location.


Second-Year Fellows 


Arian Gower​, MD

Hometown: Oakland, California 

Medical School: Rosalind Franklin University 

Residency:  MountainView Hospital - Sunrise Health 

Research/Clinical Interests: Critical Care and Electrolytes  

Hobbies: Basketball. Bowling. Breweries. Ballin' on a Budget. 

Why did you choose the University of Colorado?  There is a deliberate effort to embrace training without an expectation to provide a service on behalf of the hospital - a line that too often gets blurred and sometimes ignored in Graduate Medical Education.  This cultural approach was important to me and the Nephrology program at University of Colorado appears committed to maintaining and ensuring that distinction.  Also, the view of the mountains from my balcony each morning is incredible.


Derian Lai, MD

Hometown:  Plano, Texas 

Medical School:  Baylor College of Medicine 

Residency:  Baylor College of Medicine 

Research/Clinical Interests: General nephrology 

Hobbies:  Weightlifting, hiking, rock climbing, Brazilian jiu-jitsu 

Why did you choose the University of Colorado?   ​​Great work-life balance. The faculty is very committed to teaching. Innovative curriculum. Denver is a great city to be.​ 


Kristen Lile, DO

Hometown: Farmerville, Louisiana  

Medical School:  William Carey University College of Osteopathic Medicine 

Residency:  Unity Health (Searcy, AR) 

Research/Clinical Interests: electrolyte disorders, glomerular disease, hemodialysis  

Hobbies:  My husband and I love being outside, including anything from downhill skiing to walking our fur baby. I also love to cook (and eat), run, and explore all of the great things that Denver has to offer!  

Why did you choose the University of Colorado?   ​​I was blown away by the prestigious and well-rounded education that this program offers. We also have an unbeatable faculty and staff who support us and help us become the best physicians possible. 


Sandheep Venkataraman, MD

Hometown: New Delhi, India 

Medical School:  Madras Medical College  

Residency:  Montefiore Medical Center, Bronx 

Research/Clinical Interests: Glomerulonephritis, Critical care nephrology, renal replacement therapies​ 

Hobbies: Playing chess, cooking + eating, listening to music, reading, traveling  

Why did you choose the University of Colorado?  The supportive faculty, quality of training, the emphasis laid on work-life balance, exposure to all there is to learn in nephrology. I am also excited to experience the charm of living in a city that is surrounded by mountains.


Transplant Fellows

Keysha Lopez VegaLopez Vega, Keysha, MD

Hometown:  Juana Diaz, Puerto Rico

Medical School:  San Juan Bautista School of Medicine  

Residency:  University of Puerto Rico, Medical Science Campus

Research/Clinical Interests:  Transplant Nephrology

Hobbies:  Biking, jogging, spending time with my family

Why did you choose the University of Colorado?  I chose Colorado because of the reputation of the program, the emphasis on clinical education, a wide offer of outdoor activities, and an amazing place to live surrounded by mountains.