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Our Team

HTC Staff

The HTC is composed of a dedicated team of professionals from doctors to researchers, therapists to administrators. Find out more in the tabs below.

Hemophilia & Bleeding Disorders

Marilyn Manco-Johnson, MDMarilyn Manco-Johnson, MD

Professor of Pediatrics-Hematology/Oncology
Director, Hemophilia and Thrombosis Center

Specialty- Pediatrics-Pediatric Hematology/Oncology
Bleeding Disorders, Blood Disorders, Clotting Disorders, Pediatric Cancer

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Michael Wang, MDMichael Wang, MD

Associate Professor of Pediatrics-Hematology/Oncology
Clinical Director, Hemophilia and Thrombosis Center

Bleeding Disorders, Blood Disorders, Clotting Disorders

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Sally Stabler, MDSally Stabler, MD

Professor of Medicine-Hematology

Bleeding Disorders, Internal Medicine, Medical Oncology Hematology, Hemophilia

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Tyler Buckner, MD, MScTyler W. Buckner, MD, MSc

Assistant Professor of Medicine-Hematology

Adult and Pediatric Bleeding Disorders, Clotting Disorders, Hemophilia 


Brian Branchford, MDBrian Branchford, MD

Assistant Professor​


Jorge DiPaola, MDGenevieve Moyer, MD

Assistant Professor 

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Christopher Ng, MDChristopher Ng, MD

Assistant Professor


Beth Warren, MDBeth Warren, MD

Assistant Professor


Pediatric Stroke

Tim Bernard, MDTim Bernard, MD

Associate Professor of Pediatrics-Neurology

Clotting Disorders, Pediatric Stroke, Pediatric Health Food and Nutrition and Metabolism

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Jennifer Armstrong, MD, MPHJennifer Armstrong, MD, MPH, FAHA

Associate Professor of Pediatrics-Neurology & OB/GYN

Director, Perinatal & Neonatal Neurology Programs 

Clotting Disorders, Cerebral palsy, Neurovascular Conditions, Pediatric Stroke

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Click on the links below to skip to the appropriate area:

Advanced Practice Providers * Nursing Team * Physical Therapists * Psychology & Social Work * Child Life * Clinical Pharmacist

Advanced Practice Providers

Elizabeth GibsonElizabeth Gibson, MS, PA
Physician Assistant 

M.S., University of Colorado, Boulder
P.A., University of Colorado, Anschutz Medical Campus


Margaret MazzarelloMargaret Mazzarello FNP, AGACNP-BC
Nurse Practitioner 

AGACNP-BC, University of Colorado Anschutz Medical Campus
M.S.N., Georgia State University
B.S.N., University of Central Oklahoma


Nursing Team

Christine MashburnChristine Mashburn, RN
HTC Nurse Manager

B.S.N., University of Colorado

Amy CowellAmy Cowell, CMA
Certified Medical Assistant

C.M.A., Pima Medical Institute

Marion HuffordMarion Hufford, BSN
Clinical Nurse Coordinator 

B.S., Nutrition and Fitness, Colorado State University, Fort Collins
B.S.N., University of Colorado

Kimberly HurdstromKimberly Hurdstrom, RN-BSN
Clinical Nurse Coordinator

A.D.N, College of Southern Nevada, Las Vegas
B.S.N., Walden University​

Gail IsenhartGail Isenhart, RN-BSN
Clinical Nurse Coordinator

Cindy NederveldCindy Nederveld, RN-BSN, CPN
Clinical Nurse Coordinator

Care Coordinator-Stroke Program

Nancy SpomerNancy Spomer, RN
Hematology Nurse Specialist

B.A., Michigan State University
R.N., University of Colorado

Sarah ZellmerSarah Zellmer, RN

Physical Therapy Team


Laura FoxLaura Fox, PT, DPT
Physical Therapist 

B.S., Clemson university-Calhoun Honor College, S.C.
D.P.T., Regis University, Denver 

Rachel HortonRachel Horton, PT, DPT, CSPS
Physical Therapist 

B.S., Central Michigan University
D.P.T., University of Colorado, Anschutz Medical Campus
NSCA Certified Special Population Specialist

Rachel HortonMary O'Connell, PT, DPT 
Physical Therapist 

Psychology & Social Work


Emily WheatEmily Wheat, PhD

Licensed Clinical Psychologist 


Bryn DunhamBryn Dunham, MSW, LCSW
Social Worker 

B.S., Grove City College
M.S.W., University of Central Florida


Whitney TedeschiWhitney Tedeschi, MSW, LCSW
Social Worker 

B.S.W, Syracuse University
M.S.W., University of Pennsylvania


Child Life


Kim Richfield
Certified Child Life Specialist

Clinical Pharmacist


Timothy SchardtTimothy Schardt, PharmD, ​RPh
Clinical Pharmacist

R.Ph., PharmD, North Dakota University

​​​​​​​​​​​​​​​​ ​​​

Paul LimberisPaul Limberis, RPh
Pharmacy Manager 

R.Ph., University of Colorado, Boulder

Desiree HillDesiree Hill, PharmD, RPh
Clinical Pharmacist

R.Ph., Rick's College, Idaho
PharmD, University of Wyoming

Desiree HillOlivia Rapacchietta, PharmD, BCPS, BCACP
Clinical Pharmacist

Candice MurchisonCandice Murchison
Insurance Specialist 

B.S., Colorado State University


Kara TaylorKara Taylor, CPhT
Pharmacy Technician

C.Ph.T., Heritage College, Denver

Patricia TuckerPatricia Tucker
Pharmacy Assistant 


Click on the links below to skip to either research team:  
Clinical Research Team * Laboratory Research Team

Clinical Research Program


Kristi NortonKristi Norton, CCRP
Senior Professional Research Assistant

B.S., Psychology, University of Alabama at Birmingham
Society of Clinical Research Associates Certified Clinical Research Coordinator​

Julie SmithJulie Smith, CCRP
Senior Professional Research Assistant

B.S., Biology, University of Alabama
Society of Clinical Research Associates Certified Clinical Research Coordinator 

Molly BrownMolly Brown, BS-NDTR
Professional Research Assistant

B.S., Human Nutrition & Dietetics, Metropolitan State University of Denver, Colorado

Lindsey FurtonLindsey Furton
Professional Research Assistant

B.S., Mathmatics, Regis University

Amanda KennyAmanda Kenny
Senior Professional Research Assistant

B.A., Psychology, University of Iowa
M.A., Counseling and Family Therapy, St. Louis University, Missouri

Jason ThomasJason Thomas
Professional Research Assistant

B.S., Organismal Biology, Montana State University

Dianne ThornhillDianne Thornhill, PhD

B.A., B.S., University of Roches​ter, New York
M.S., Binghamton University, New York
Ph.D., Binghamton University, New York

Amanda WeberAmanda Weber
Professional Research Assistant

Laboratory Research Team

Linda JacobsonLinda Jacobson, M.T. (ASCP)
Research Lab Senior Tech

B.S., Medical Technology, University of South Dakota

Katherine RueggKatherine Ruegg
Professional Research Assistant

M.S., Biology, Central Michigan University
B.S., Biology, Lake Superior State University, Michigan

Christine BairdChristine Baird
Research Lab Tech



Angela BlueAngela Blue
Program Director

B.A., Communications, University of Minnesota Duluth
M.B.A., Healthcare Administration, Concordia University

Rose DrakeRose Drake
Patient Services Coordinator 

Clinic Front Desk

Karen Walton, MS, RN 
Unit Manager

B.S., Nursing, Brigham Young University
M.S., Nursing, Regis University 

Donna OscepinskiDonna Oscepinski
Operations Manager

M.B.A., Strayer University

Steven PowellSteven Powell
Financial Manager

B.S., Business Administration, California Polytechnic University
M.B.A., Claremont Graduate University

Lynn MagnusonLynn Magnuson

Yevette Portillo-CorralYevette Portillo-Corral
Prior Authorization Specialist 

Rae Gerold-SmithRae Gerold-Smith
Business Support Coordinator 

Pat CasiasPat Casias
Program Assistant


Merilee AshtonMerilee Ashton
Communications and Media Coordinator

B.A., Broadcasting, Arizona State University

Kevin Anthony
Technology Manager


Rick ShearerRick Shearer
Data Manager

B.S., Computer Information Systems, Regis University

Nicholas MillerNicholas Miller
Records Management Supervisor

B.A., Communications, Miami University
M.A., Journalism, DePaul University

Greg MahGreg Mah
Document Scanner

B.S., Math, Metropolitan State University of Denver