Jeffries was a double major at Duke, earning a bachelor's degree in electrical engineering and public policy.
The Strikers released Jeffries in the fall of 1987 and he signed as a free agent with the Dallas Sidekicks on October 20, 1987.
He spent the next three seasons as an assistant coach to Bob Bradley, helping the team to the 1998 MLS championship and 1998 and 2000 Lamar Hunt U.S. Open Cup titles.
After being fired by the Burn, Jeffries remained in Dallas and served as a volunteer coach with Southern Methodist University (SMU) during the 2004 NCAA season.
In January 2013, Jeffries was introduced as head coach of the Des Moines Menace, a USL Premier Development League club.
[2] Jeffries was hired as head coach for the USL Pro expansion club Charlotte Independence on December 5, 2014.
On June 12, 2019, Jeffries resumed his duties as head coach for the Charlotte Independence, while remaining as the team's general manager.
Jeffries married Theresa Ann Tauer during his time with the Minnesota Strikers, and they had 3 children: Kaitlin, Anthony (A.J.