Bill Lash began skiing at the age of twelve at Magic Mountain, Idaho and became its Ski School Director in 1947. In December 1950, he received his Intermountain Ski Instructors Association (ISIA) Certification 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.
Spearheaded by Bill in 1961, the Professional Ski Instructors of America (PSIA) was established. He was elected the first President and served eight years. During that time, he helped develop the American Teaching Method, sent the first U.S. Delegation to Interski (International Ski Congress), 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's Official American Ski Technique, the first book for the primary use of ski instructors.
