Applied Behavior Analysis Therapist (ABA). ABA Therapist- “ABA Therapist” is just one of the many ways to label professionals working directly with clients or students. The label we use at the LeafWing Center is Behavior Technician (BT). Other labels used are 1:1s, para-professionals, tutors, behavior therapists, shadows, and behavior interventionists to name a few. The label used depends on the agency/company/school/institution providing direct ABA services. Regardless of the label, these individuals work under the supervision of a BCBA or BCBA-D.