Later this month, leading scientists and cutting-edge thinkers will gather at the International AIDS Society’s 9th IAS Conference on HIV Science in Paris to discuss the latest scientific discoveries in HIV prevention, care and treatment. These discoveries hold the potential to accelerate progress toward the global 90-90-90 targets set forth by the Joint United Nations Programme on HIV/AIDS (UNAIDS). And, they are especially important for key populations — including men who have sex with men, sex workers, transgender people and people who inject drugs — who shoulder a disproportionate burden of HIV. UNAIDS estimates that 45 percent of all new HIV infections among adults worldwide occur among these key populations and their sex partners. Reaching these groups with new technologies and approaches is essential to ending the epidemic.