Program Leaders

Program Director


Ruben Quiros, MD
Chief, Pediatric GI, Hepatology & Nutrition  Medical Director, Pediatric Liver & Intestinal Transplantation
Dr. Quiros grew up in Panama City, Panama. After he received his medical degree in Panama  he pursued his residency in Children’s Hospital of Panama as well as a residency in Philadelphia. He then attended a Gastroenterology and Nutrition Fellowship at UCLA in Los Angeles, California. Directly after his first fellowship he went into an advanced clinical fellowship for another two years. After many years of schooling he and his growing family put down roots in Rochester New York as the Director of the Pediatric Hepatology Program.

After a few years he decided to move on taking on many roles at Texas Children’s Hospital and University of Texas in Houston, Texas. Dr. Quiros and his family stayed in Texas until their final move to Omaha, Nebraska. Here, Dr. Quiros took on again, many roles. Now, he is not only the Fellowship Program Director for the Pediatric, GI, Hepatology and Nutrition program but also is the Medical Director for the Pediatric Liver/Intestinal Transplantation with the Lied Transplant Center as well as the Chief of Pediatric GI, Hepatology, and Nutrition Program. Needless to say, Dr. Quiros is a very busy man. After many internships, committees, awards, distinguished roles and recognition Dr. Quiros still remains very patient and humble. He has an open door policy and is always willing to listen or help someone in need. He has brought this program to where it is, and he has no plans of stopping any time soon!

Dr. Quiros recently was announced as the September Program Director of the month! Congratulations Dr. Quiros on this very well deserved title! Please click here to read the whole interview.


Program Coordinator

Jesse Coyer

Since March 2014 Ms. Coyer has been both the Pediatric GI, Hepatology & Nutrition Fellowship Coordinator as well becoming the Pediatric Transplant Hepatology Fellowship Coordinator in 2016. She is diligent in the task of working alongside the management staff at Children’s Hospital & Medical Center to ensure a smooth and effortless Pediatric GI division. Upon assuming this role she brought new excitement and life to the program. The fellows count on Ms. Coyer for her organization, time management and motherly role in their lives. They trust her knowledge and rely on her advice. She is also instrumental in the recruitment process and goes out of her way to make every applicant feel accepted and valued. Her personality makes everyone she comes into contact feel as if you’re an old friend.

Prior to coming to UNMC, Ms. Coyer worked for Alegent Creighton Health for 14 years in different healthcare areas, so she is very well versed in the medical field. She has said she grew up working in healthcare and loves seeing an impact of her hard work. She enjoys working alongside like-minded individuals who don’t want to settle but make a difference in the lives around her.

Assistant Professors


Mark Kusek, MD
Assistant Professor of Pediatrics

Dr. Kusek received his MD at UNMC in 2008. From there he completed his residency in South Carolina and two fellowships. His first fellowship was his Pediatric GI fellowship in Massachusetts at Massachusetts General Hospital for Children, directly followed by a Pediatric Motility Fellowships at Nationwide Children’s Hospital in Ohio. Dr. Kusek decided to moved back to the Omaha area to begin working at Children’s Hospital and Medical Center. Dr. Kusek brings a lot of new ambition to several programs and areas within both GI and Motility. We are anxious to see where these areas continue to grow.

Dr. Kusek's current research includes: Principal Investigator at our center in the multi-center COMBINE trial (Clinical Outcomes of Methotrexate Binary treatment with INfliximab or adalimumab in practicE). This study for pediatric patients with Crohn's disease is investigating the effects of methotrexate vs. placebo in combination with an anti-TNF biologic (infliximab or adalimumab).

QI: Physician Leader for our center in ImproveCareNow which is not only an international registry of pediatric patients with inflammatory bowel disease, but also has created a collaborative community where clinicians, researchers, parents and patients are empowered to learn and continuously improve to bring about more reliable, proactive IBD care for healthier children and youth. Our core ICN team includes 2 physicians, 1 APRN, 2 RNs, 1 RN research coordinator, 1 dietitian, 1 psychologist.

Dr. Kusek's current committees include: Children's Hospital and Medical Center, Credentialing Committee and Chrhn's and Colitis Foundation, Nebraska/Iowa Chapter, Board of Directors



Emille Reyes, MD
Assistant Professor of Pediatrics   
Dr. Reyes is our third Transplant Hepatologist to join our team. She finished her Pediatric Transplant Hepatology Fellowship at Emory University in Atlanta, Georgia. Prior to leaving for her Hepatology Fellowship Dr. Reyes successfully completed her Pediatric Gastroenterology Fellowship at UNMC. Dr. Reyes completed her residency in Puerto Rico after she received her medical degree. Dr. Reyes is great addition to have on our team and our patients are excited to have her back as well.

Dr. Reyes' research interest include:  Pediatric Liver Transplantation, Biliary Diseases, Biliary Atresia, Autoimmune Liver Disease, Parenteral Nutrition Associated Liver Disease, Obesity-related Steatohepatitis.


Andrew Huang, MD
Assistant Professor of Pediatrics

Dr. Andrew Huang completed his Pediatric Gastroenterology training here at UNMC.  He completed his residency at Miami Children's Hospital where he has recruited current fellows in our program as well.  Dr. Huang has been a great resource for our advanced procedures, bringing clear insight into a role of an attending and mentor.


Ojasvini Choudhry Chandan, MD
Assistant Professor of Pediatrics

Dr. Chandan completed her Pediatric Residency at the University of Nebraska Medical Center. She not only completed her residency at UNMC but then found herself staying to complete her Pediatric Gastroenterology fellowship. Dr. Chandan enjoys her work here so much she accepted a faculty position right out of fellowship. Dr. Chandan is in a unique position being able to say she began her career at UNMC as a resident.We are grateful for the commitment Dr. Chandan has to our organization. 

Dr. Chanda's current research includes: COMBINE trail co-primary investigator and various fellow research projects.

Dr. Chandan's current committees include: Resident CCC committee, Crohn's and Colitis - CMAC (Chapter medical advisory committee)


Dr. David Freestone, DO
Assistant Professor of Pediatrics

Dr. David Freestone graduated from his Pediatric Residency program at the University of Nevada School of Medicine. After residency Dr. Freestone began his Pediatric Gastroenterology Fellowship at UNMC. Dr. Freestone remains as a vital member of our faculty at Children's Hospital and Medical Center where he thrives not only with GI conditions but nutrition as well. 


Warapan Nakayuenyongsuk, MD
Assistant Professor of Pediatrics

Dr. Nakayuenyongsuk completed her Pediatric Residency at the University of Arkansas for Medical Sciences. After Residency she went onto complete her Pediatric Gastroenterology Fellowship at Stanford University. Dr. Nakayuenyongsuk took her training one step further and completed her Pediatric Transplant Hepatology Fellowship at UNMC. After that fellowship Dr. Nakayuenyongsuk was able to begin her Pediatric Transplant Hepatology career at UNMC where she is our fourth hepatologist and has been the final piece to forming this exceptional team.