This article presents results from a large-scale study of professionals who work with individuals who are deaf or hard-of-hearing (DHH). Participants were 1,345 professionals who work in a variety of roles, including educators, administrators, interpreters, vocational rehabilitation agency staff, and allied service providers. Participants shared their perspectives on transition experiences for individuals who are DHH, as well as their own preparedness to support their clients through this process. Data come from a national survey, interviews, and focus groups. Results demonstrate that professionals' years of experience was a significant predictor of multiple outcomes, even when controlling for characteristics of professionals and their clients. Discussion includes implications of these findings for practice and areas for future research.