Professor of Chemistry and a Fellow of CIRES at the University of Colorado at Boulder

Consultant Virologist/Honorary Associate Professor at the Clinical Microbiology, University Hospitals of Leicester NHS Trust/ Respiratory Sciences, University of Leicester, UK

Professor of Mechanical Engineering and faculty in the Environmental Engineering Program at the University of Colorado Boulder

Mechanical Engineer in the Indoor Air Quality and Ventilation Group at NIST

Charles P. Lunsford Professor of Civil and Environmental Engineering at Virginia Tech

Senior Principal Investigator and the Aerobiology Team Lead at the National Biodefense Analysis and Countermeasures Center (NBACC) at Fort Detrick, Maryland, USA, operated by Battelle National Biodefense Institute for the US Department of Homeland Security.