Leor S. Weinberger is an American virologist and quantitative biologist. He is credited with discovering the HIV virus latency circuit, which provided the first experimental evidence that stochastic fluctuations ('noise') in gene expression are used for cell fate decisions. He has also pioneered the concept of Therapeutic Interfering Particles, or “TIPs”, which are resistance-proof antivirals. His TED talk on this novel antiviral approach 20 years in the making has been called a "highlight" of TED and received a standing ovation from the live audience.