Dr. Erickson has been working with people with psychosis for more than twenty years. Since graduating from the UBC Clinical Psychology program, his emphasis has been on integrating psychosocial treatments into routine clinical practice, in particular for patients with early psychosis. For example, while at the Royal Ottawa Hospital he helped to establish the Optimal Treatment Program (Falloon, Morosini, Erickson et al., 1998) for early psychosis.

Since returning to Vancouver, he has developed an interest in a new psychotherapy for psychosis called cognitive-behavior therapy (CBT), for patients with medication-resistant symptoms. He has published in the areas of early psychosis, social support, and the treatment of anxiety disorders. In 2004, he joined the Fraser North Early Psychosis Program in Port Moody. His duties there include CBT for early psychosis, psychological assessment, and program development.