The study in this article compared counselors and teachers on measures of suicide knowledge and prevention practices after participation in a statewide training program in student suicide prevention using the "Question, Persuade, and Refer" program. Follow-up surveys conducted an average of 4.7 months after training indicated that trainees (73 counselors and 165 teachers) demonstrated greater knowledge of suicide risk factors and reported making more no-harm contracts than did controls (74 counselors and 98 teachers). In comparison to teachers, counselors demonstrated greater knowledge of risk factors and reported questioning more potentially suicidal students and making more contracts and outside referrals. These findings support the value of gatekeeper training for both counselors and teachers and substantiate the important role of counselors in suicide prevention. (Contains 1 table.)