Greg Crosby, MA, LPC, is a practicing therapist and college and graduate school instructor. In 1994, he started the first adult attention deficit/hyperactivity disorder (ADHD) group for the Kaiser Permanente Northwest Region, and has been working with the Oregon Attorney Assistance Program providing ADHD workshops since 2013. Crosby is a certified group psychotherapist and group psychotherapy fellow. He teaches adult ADHD classes at Portland State University and Marylhurst University. Crosby offers workshops on ADHD for professionals, and has a private practice where he works with adults diagnosed with ADHD.