Elizabeth (Libby) Street is a PSIP consultant. She also is the special assistant to the president and a professor of psychology at Central Washington University in nearby Ellensburg, WA. She received her bachelor's degree (1968) in math education at West Virginia University. She later completed an MA (1969) and an Ed.D. (1977) in educational psychology at West Virginia University, where she studied with Dr. Julie Vargas. Dr. Street moved to Illinois to work in Dr. Sidney Bijou's Child Behavior Laboratory at the University of Illinois in 1971 and later became director of HEED School in Champaign, Illinois. HEED school was the first private day treatment program for emotionally disturbed children in the state of Illinois. Libby also served as the director of the adolescent unit of Adolph Meyer Mental Health Center before taking a faculty position in the Department of Psychology at the University of Wisconsin - LaCrosse. In Lacrosse, Libby prepared special education teachers and school psychologists and served as a consultant to a variety of schools and agencies serving special needs populations.

In 1978, Libby moved to Ellensburg, Washington where she served briefly as the director of the children and family unit at the Comprehensive Mental Health Center of Central Washington. In 1979, she accepted a faculty position at Central Washington University. In her role as professor of psychology, she prepares undergraduate and graduate psychology majors and teaches courses in educational psychology for teaching candidates. She continues to serve as a consultant and trainer for schools and agencies. Although she continues to teach classes, she now serves as special assistant to the university's president.

Dr. Street was an American Psychological Association - AAAS congressional science fellow during the 1994-95 academic year. During that year, she served on the education staff of Senator Edward Kennedy, Libby has had a 20-year association with Morningside Academy, serving as a member of the board of directors, as a consultant and trainer, and as a co-coordinator for the Morningside Summer School Institute.