Our Team


Rafael Pérez-Escamilla, PhD
PRC Principal Investigator

Kathleen O’Connor Duffany, PhD
PRC Co-Director

Beth Patton Comerford, MS
PRC Co-Director


Valentine Yanchou Njike, MD, MPH
Assistant Director of PRC Research and Evaluation

Katherine LaMonaca, MPH
Assistant Director of Research and Evaluation for PRC & Community Alliance for Research and Engagement (CARE)

Jaime Foster, PhD, RD
Research Scientist

Amber Homi-Fiedler, PhD, MPH
Research Scientist

Rockiy G. Ayettey, MS, DHSc
PRC Coordinator and Lead Research Associate

Jackson T. Higginbottom, MPH
Lead for Initiative for Strategic Health Communications

Allison Beaulieu, MPH
Program Manager

Meredith Campbell Britton, LMSW  
Research Associate 

Sofia I. Morales, MPH  
Program Manager of PRC Community Advisory Board and Program Manager of Community Alliance for Research and Engagement (CARE)

Summaya Multaney, MBBS  
Research Associate

Andrea Mayer
Vascular Ultrasonographer and Research Associate


Elizabeth Rhodes, PhD, MS
Co-Investigator of Center for Food is Medicine

Marney White, PhD, MS
Scientific Director of Initiative for Strategic Health Communications

Debbie Humphries, Phd, MPH, MA
Assistant Professor of Chronic Disease & Epidemiology


Alycia Santilli, MSW
Director of Community Alliance for Research and Engagement (CARE)


Rockiy G. Ayettey, MS, DHSc

Center Coordinator/Lead Research Associate

Phone: 203-732-1125

Research Interests/Roles

Ms. Rockiy G. Ayettey is a Research Associate/ Grants Coordinator at the PRC. Her role involves coordination of both clinical research studies activities and grant-related activities.


  • MS, Human Nutrition, University of Bridgeport, CT.
  • BSc., Biological Sciences, Kwame Nkrumah University of Science and Technology in Ghana, West Africa.

Selected Publications

  • Njike VY, Ayettey RG, Rajebi H, Treu JA, Katz DL. Egg ingestion in adults with type 2 diabetes: effects on glycemic control, anthropometry, and diet quality—a randomized, controlled, crossover trial. BMJ Open Diabetes Research and Care 2016 Dec 22;4:e000281.

  • Njike VY, Yarandi N, Petraro P, Ayettey RG, Treu JA, Katz DL; Inclusion of walnut in the diets of adults at risk for type 2 diabetes and their dietary pattern changes: a randomized, controlled, crossover trial. BMJ Open Diabetes Res Care. 2016 Oct 19;4(1):e000293.

  • Njike VY, Ayettey R, Petraro P, Treu JA, Katz DL. Walnut ingestion in adults at risk for diabetes: effects on body composition, diet quality, and cardiac risk measures. BMJ Open Diabetes Research and Care 2015;3:e000115.

  • Katz DL, Treu JA, Ayettey RG, Kavak Y, Katz C, Njike V. Testing the validity and reliability of an abbreviated version of the Nutrition Detectives™ program.  Preventing Chronic Disease.  2014 April 10; 11:E57.