Darryl Miller has worked as a medical volunteer for USA Wrestling since 1993.

He served as the chief athletic trainer for USA Wrestling at the 1996 Olympics and was the head athletic trainer for USA Wrestling at the 2008, 2012 and 2016 Olympics and the 2007 Pan American Games. Miller worked eight World Championships while also working four U.S. Olympic Trials and at the U.S. Nationals from 1996 to 2005. He worked 12 World Cups from 1994 to 2010 while also working at the 1993 Minsk Dual, the 1995 Cerro Pelado tournament, and the Krasnoyarsk tournament from 1996 to 1999.

Miller made presentations on emergency procedures, skin lesions and CPR/First Aid for coaches at USA Wrestling clinics at the Bronze and Silver levels for several years.

Miller was director of the high school outreach program at the University of Colorado-Denver from 1988 to 1995. He then became the secondary education instructor of athletic training/emergency medicine and director of sports medicine for Denver Public Schools. He served as vice president of the Colorado Athletic Trainers' Association and Licensure Committee and as chairman for the National Strength and Conditioning Association's state clinic in Colorado.

For 28 years Miller volunteered to implement and organize the Denver Public Schools High School Thanksgiving Championship Wrestling Clinic, featuring NCAA champions and Olympic and World medalists as instructors.

He also spent 16 years as the head athletic trainer for the Colorado High School All-State Games while serving as a volunteer for Special Olympics and Lift America.

Miller received the Colorado High School Activities Association Distinguished Service Award while also being named Denver Public Schools Distinguished Teacher of the Year and the recipient of the Lloyd Gasgill award from the Colorado High School Coaches Association.

He is a member of the Denver Public Schools Athletic Hall of Fame and the Colorado Athletic Trainers' Association Hall of Fame.

Miller was named University of Wisconsin Athletic Trainer of the Year in 1984 and received the HealthONE Community Partner award in 2001 and the National Athletic Trainers' Association Athletic Trainers Service Award in 2005. He received the Lifetime Service award from the Colorado Chapter of the National Wrestling Hall of Fame in 2017.

Miller received his bachelor's degree with double major in physical education and industrial education from the University of Wisconsin-Platteville while also lettering four years in gymnastics and three years in soccer. He received his master's degree in exercise physiology and National Athletic Trainers' Association Board of Certification from the University of Wisconsin-Madison.

Miller was co-director of the exercise physiology lab and the high school outreach athletic trainer at Wisconsin-Madison.

He served in the United States Marines Corps from 1971 to 1974, as a member of the Marine Corps Special Forces (First & Third Force Reconnaissance).