Skip to main content Skip to navigation
We care about your privacy. Read about your rights and how we protect your data. Get Details

Meet the Team

Nikki Posnack, PhD
Assistant Professor,
Children’s National Heart Institute, Sheikh Zayed Institute for Pediatric Surgical Innovation: Children’s National Health System

Department of Pediatrics, Department of Pharmacology and Physiology: George Washington University, School of Medicine and Health Sciences

PhD, Department of Pharmacology and Physiology, George Washington University, 2009
BS, Department of Biology, Department of Chemistry, Washington College, 2004

Research interests:
My research is broadly focused on how pharmacological and toxicological exposures affect cardiovascular function. Recently, our laboratory has been investigating the impact of biocompatibility and hospital-based chemical exposures (including phthalates and bisphenols) on cardiovascular health and autonomic regulation. Our laboratory also develops models to comprehensively screen medical device materials, additives and biocompatible device coatings for cardiotoxicity. Our research group is multidisciplinary, and includes individuals with expertise in cardiovascular physiology, pharmacology, toxicology and biomedical engineering. As such, our laboratory has specialized skills in cardiovascular models (neonatal & adult myocytes, human stem cell-derived myocytes, ex vivo perfused hearts, in vivo radiotelemetry, induced pluripotent stem cells), electrophysiology, imaging modalities (confocal, optical mapping, optical spectroscopy) and phenotypic assays (metabolic, gene expression arrays, calcium and voltage dyes).

nposnack@childrensnational.org  |  PI biopage


Rafael Jaimes 2017

Rafael Jaimes, PhD
Staff Scientist
PhD in Biomedical Engineering from The George Washington University
BS and MS in Biomedical Engineering from Worcester Polytechnic Institute.

rjaimes@childrensnational.org


Luther Swift

Luther Swift, PhD
Staff Scientist
PhD, Molecular Medicine -The George Washington University, Washington, DC.
MS, Microbiology - Texas Tech University, Lubbock TX
BA, Biology - Southwestern University, Georgetown TX.

Lswift2@childrensnational.org


Bryan Seigel 2017

Bryan Siegel, MD
Cardiology Fellow
Dartmouth BA, New York University School of Medicine MD
Yale-New Haven Hospital Pediatric Residency
Children’s National Cardiology Fellowship

Bsiegel@childrensnational.org


Ashika Chaluvadi
Research Assistant
B.S., George Mason University


Daniel McInerney 2017

Daniel McInerney
Research Assistant
Undergraduate in Biology at George Washington University

dmcinerney21@gwu.edu


James Hiebert 2017

James Hiebert
Research Assistant
BS, Biology, George Washington University
AS, Medical Laboratory Science, George Washington University

Jhibert1691@gwu.edu


Manelle Ramadan

Manelle Ramadan
Research Technician
B.S., Biology - Pennsylvania State University

mramadan2@childrensnational.org



Morgan Burke
Research Assistant
B.S., Michigan State University

Burkemt@gwu.edu