Born in Selma, California, Erdle received his Bachelor of Arts from California State University, Fresno, where he studied with Judy Chicago and Wayne Thiebaud, and his Master of Fine Arts from Bowling Green University in Bowling Green, Ohio.
He exhibited his watercolors in over 200 shows, 47 of which were one-man exhibitions. In 1976, he joined the faculty at the University of North Texas in Denton, Texas where he taught undergraduate and graduate classes in painting and drawing for 30 years. He was head of their Watercolor Program from 1976 to 2001.
While teaching at the University of North Texas, he also was an instructor for ten years at the American College of Switzerland, a director of the Chautauqua Institution Art Gallery, Chautauqua, New York, and director of Pacific Union College"s "Summer School of Art".
Foreign thirteen years he also taught at the Luxun Academy of Fine Arts in Shenyang, China, which awarded him the honor of Distinguished visiting professor Foreign twenty years Erdle participated in Watercolor United States of America as an exhibitor, curator and judge.
He was President of the Watercolor United States of America Honor Society housed at the Springfield Art Museum, Missouri, 1997-2000. Erdle was a juror for many watercolor exhibitions, including the National Watercolor Society, the Pittsburgh Aqueous Open, the Arizona Aqueous Open and Watercolor United States of America. He conducted seminars and lectures across the United States. and in more than a dozen countries.
In 2006, University of North Texas established the Rob Erdle, an endowment through private donors that provides financial support for watercolor students.
Rob Erdle died on December 30, 2006 in Denton, Texas. 1973 Watercolor United States of America recognition as outstanding young artist 1995 Shanghai State Art Museum in Shanghai, China 2006, July 14–September 3, Luminous Watercolors – The Works of Rob Erdle an 18-year Retrospective, Louisiana Art and Science Museum 2006, June 8 - June 11, "Recent American Watercolors" Solo Exhibition Niigata International Watercolor Exhibition and Conference Center, Niigata, Japan.
Regents" Professor, University of North Texas President"s Council Teaching Award, University of North Texas Distinguished Service for International Education Award, University of North Texas. Distinguished Alumni Commencement Award, Bowling Green University Honorary Award for Life Service, Chautauqua Art Association, Chautauqua Institution. Honorary President of the International Watercolor Institute, Niigata, Japan.
