Abstract: The A.S.K.-PrEP (Assistance Services Knowledge-PrEP) program works with extremely high-risk HIV-negative trans women and men who have sex with men to link participants into PrEP medical services. A.S.K.-PrEP consists of individualized, client-centered PrEP navigation sessions to assess PrEP readiness, assess barriers to PrEP initiation and/or adherence, assess readiness for adherence, and to plan for PrEP persistence. Additionally, through the five-session A.S.K.-PrEP intervention, the PrEP navigator works with each participant to remove structural barriers to PrEP initiation/adherence (mental health, substance use [including injection drug use], intimate partner violence, STDs, housing, hormones, sex work), insurance enrollment/patient assistance), link participants into needed ancillary services, all with the ultimate goal of linkage to PrEP and persistent daily PrEP adherence. Discussions of PrEP readiness and individual and structural barriers to PrEP linkage and adherence occur throughout the five sessions. Throughout the duration of the project, participants can opt-in/opt-out of receiving culturally competent, theory-based PrEP adherence support text messages. Each text message has a theoretical conceptual foundation based on Social Support Theory (to provide informational, emotional or instrumental PrEP support), Health Belief Model (to identify or reduce HIV risks) or Social Cognitive Theory (to increase self-regulation skills and self-efficacy for PrEP persistence). A.S.K.-PrEP partners with three local clinics to provide culturally appropriate PrEP medical services.