Our Team

Picture of Kathryn Hassel Kathryn Hassel, MD
Director & Professor

Dr. Hassell has been the Director of the Center since 2003, after serving as its Associate Director since 1992.  She has been with the University since 1989.  Dr. Hassell provides inpatient and outpatient care to adults with sickle cell disease at the University of Colorado Hospital.  She is a site principal investigator for multi-center clinical trials for adults with sickle cell disease, and has provided national leadership on study steering and executive committees.  

Dr. Hassell has led several regional projects through the Mountain States Genetics Regional Collaborative Center, and serves on the Newborn Screening Advisory Committee for the Colorado State Department of Health.  She also sits on the steering committees of a number of national projects including the Sickle Cell Disease Treatment Demonstration Project for HRSA, the American Society of Hematology’s Public Health Taskforce, and the Registries and Surveillance for Hemoglobinopathies (RuSH) Project for the CDC and NIH.Dr. Hassell recently completed a four-year, part-time, IPA assignment with the National Heart, Lung and Blood Institute (NHLBI).

Rachel Nuss, MD Rachelle Nuss, MD
Associate Director

Dr. Nuss has been with the University since 1988.  She directs the pediatric program of the Colorado Sickle Cell Treatment and Research Center at The Children’s Hospital in Denver and conducts outreach clinics in Colorado Springs.   

Dr. Nuss is a site principal investigator for multi-center clinical trials for children with sickle cell disease; she has led investigator-initiated translational and early phase clinical studies, and collaborates with basic science investigators. 


Center PersonnelTitleContact Information
Kathryn Hassell, MD  Director and Professor
Adult Hematologist
720-848-0300  Clinic / Patient Needs
720-848-4017  Clinic FAX Number
303-724-9070  Center Administration
Rachelle Nuss, MDProfessor
Pediatric Hematologist
720-777-6740  Clinic / Patient Needs
720-777-7230  Clinic FAX Number
303-724-9070  Center Administration
Cheri BurgeCenter Administrator
Finance and Business
303-724-9070  Center Administration
303-724-9171  Office
720-217-1306  Cell
Cheri.Burge@cuanschutz.edu
Michael Regier, MSW, LCSWTransition Program Coordinator 

303-724-9066  Office
720-206-4885  Cell

Michael.Regier@childrenscolorado.org
Michael.Regier@cuanschutz.edu 

Nece Pounds, RN Pediatric Nurse and 
Patient Care Coordinator

720-777-6740  Clinic / Patient Needs
720-777-7230  Clinic FAX Number

Aneisia.Pounds@childrenscolorado.org

Julie McAfee, BS Clinical Research Coordinator303-724-9072  Office
Julie.McAfee@cuanschutz.edu
Donna Holstein, RN, BSN 

Coordinator and Clinical Educator Newborn Screening Follow-Up Program 

303-724-9075
Donna.Holstein@cuanschutz.edu