Rainer Wulf grew up in the San Gabriel Valley of southern California and graduated from Bishop Amat High School in 1978. He was a member of the basketball team where he received the Pat Haden Scholar-Athlete Award during his senior year. After a 2 year stint at Citrus Community College in Azusa, Ca., Rainer moved on to U.C. Irvine where he was a member of the Men's Basketball team and graduated in 1982. He earned a Bachelors of Arts Degree in Social Sciences and a Secondary School Teaching Credential in 1983.

He played professional basketball in Sydney, Australia and returned in 1985 to begin his teaching and coaching career at University High School in Irvine, Ca. In 1987 Rainer was hired as a Social Science Teacher and Head Boy's Basketball Coach at Trabuco Hills High School in Mission Viejo, Ca. In his tenure at THHS, the Runnin' Mustangs won 2 CIF-SS Championships and were California State Finalists in 1989. Twice he was named CIF-SS Coach of the Year. He was inducted into the Southern California Interscholastic Basketball Coaches Association's Hall of Fame in 2011.

Rainer has earned his Master of Arts Degree in Education from Azusa-Pacific University and in 1998 was hired as an Athletic Director at Trabuco Hills. In 2008 he was named the CIF-SS Athletic Director of the Year by the California State Athletic Directors Association. He served in that capacity until 2008 when he was hired as an Assistant Commissioner of Athletics by the California Interscholastic Federation - Southern Section. Currently, Rainer administrates basketball, track & field, cross country and tennis, while also involved with student eligibility for the CIF-SS.

In the fall term of 2009, Rainer began teaching in the Concordia University Masters Degree Program in Coaching and Athletic Administration. He has taught MCAA 562 – Facilities and Event Management as well as MCAA 573 - Advanced Theories & Strategies for Coaching Basketball. This term Rainer has begun advising in the MCAA 595 – Culminating Project course for students completing their Professional Portfolios and earning their Masters Degrees.