Tackett saw Bruce Lee demonstrate Jeet Kune Do in 1967 at Ed Parker's tournament in Long Beach, California. Busy with college and supporting a family he closed his Gung Fu school and focused on his education. Soon after receiving his M.F.A. in 1970 he began a career as a high school drama teacher (he is now retired) from Montclair High School then Etiwanda High School. Along with his first student Bob Chapman, he visited Dan Inosanto's backyard Jeet Kune Do school on the recommendation of Dan Lee. At that time the class consisted of about 10 students including Bob Bremer, Dan Lee, Richard Bustillo, Pete Jacobs and Jerry Poteet.
In 1973 he was given a senior instructor's rank by Dan Inosanto and was permitted to teach Jeet Kune Do to a small group of students. Having no desire to teach JKD publicly, he moved his most senior group of students to his garage in Redlands, California where he continues to hold classes every Wednesday night. Beginning around 1983, Tackett and Larry Hartsell taught Jeet Kune Do at Vic Payne’s Great Smokey Mountain Martial Arts Camp every summer of its existence and has taught courses throughout the United States and in Europe. He is also known for applying martial arts principles to football; he has worked with the Dallas Cowboys and San Francisco 49ers in this regard.