Professor Geoghegan is a virologist specializing in the evolution of emerging infectious diseases, metagenomics, and viral host-jumping dynamics. She notably served as the senior and corresponding author for a 2024 study on the molecular epidemiology of the HIV-1 epidemic in Fiji, overseeing the scientific design and genomic analyses to guide public health interventions.

Director of Implementation Research and Innovation, Tangerine Clinic, Institute of HIV Research and Innovation (IHRI), Thailand. Rena is Director of Implementation Research and Innovation at the Institute of HIV Research and Innovation in Thailand. A leader in transgender health and HIV implementation science, she co-founded Tangerine Clinic, Asia's first transgender-led integrated gender-affirming and sexual health clinic and is internationally recognized for advancing community-led HIV prevention and health equity.