Final answer:
Dr. Brittain, using a technique where the client plays a crucial role and the therapist offers a supportive environment, is likely a Humanistic therapist, an approach echoing Carl Rogers's client-centered therapy.
Step-by-step explanation:
Dr. Brittain, who provides a therapeutic technique that focuses on a supportive emotional climate where clients play a major role in determining the pace and direction of therapy, is most likely a Humanistic therapist. This approach aligns closely with client-centered therapy, a concept developed by Carl Rogers. In this therapeutic model, the therapist facilitates personal growth by providing unconditional positive regard, genuineness, and empathy, allowing the client to lead the therapy session. The characteristics of this approach contrast with other types such as psychoanalysis, where the therapist interprets unconscious content, or behavioral and cognitive therapies, which focus on modifying dysfunctional behaviors or thoughts, respectively.