We investigated counseling psychologists' (N= 165) vocational diagnostic and treatment decisions when vocational and personal problems are presented concurrently. Participants assessed the same vocational problem either alone or in conjunction with a personal problem of one-half, equal, or double the severity of the vocational problem. Without consideration for counselors' problem preference, ratings of the vocational problem were equivalent across the three personal problem severity levels. However, with preferences considered, counseling psychologists who reported greater preference for working with personal problems, in comparison to vocational problems, were less likely to assess, diagnose, and treat the vocational problem than were counseling psychologists who reported equivalent or reversed problem preferences. This biasing effect occurred when the personal problem was of equal or double the severity of the vocational problem.