Bill Lash began skiing at age 12 at Magic Mountain, Idaho, and became its Ski School Director in 1947. He became certified in March 1950 at Alta, the first season the certification program was instituted.
In November 1951, at age 23, Bill was elected President of ISIA. He served as chairman of the National Ski Association Certification committee from 1958 to 1961.
In 1961, PSIA was established, spearheaded by Bill. He was elected the first president and served 8 years. During that time, he helped develop the American Teaching Method, sent the first U.S. Delegation to Interski, and staged the first Interski held in North America in Aspen in 1968.
Bill wrote Outline of Ski Teaching Methods and served as editorial coordinator for the first and second editions of PSIA'sOfficial American Ski Technique, the first book for the primary use of ski instructors.