Applied behavior analysis (ABA) therapy alters the way people handle stimuli. People with autism often benefit from ABA therapy, as it helps them respond helpfully to triggering events, including loud noises and strong emotions. ABA therapists apply this form of treatment. Some ABA therapists hold undergraduate degrees, and they work beneath skilled professionals who design the treatment plans they giveto their clients. Others hold advanced degrees, and they supervise a team of professionals, helping them to serve many clients.