Deffendall is in his 17th season with Wabash Valley. Prior to his time at WVC, Deffendall was an Assistant Coach at Olney Central College in Olney, IL. He has accumulated a 648-125 record at WVC and an overall record of 717-179.
During his time at Wabash Valley he has been part of 7 Region XXIV Championships, 1 NJCAA National Tournament Final 4, and 10 Great Rivers Athletic Conference Championships. His duties as an assistant coach include recruiting, working with pitchers, maintaining the website, and preparing the field. He also serves as the WVC Bookstore Manager.
Asa and his wife Megan have 2 children: Delaney (6) and Jacob (4).