Yeast serves as the Assistant Coordinator of Umpires for the Umpire Consortium that includes the SEC, OVC, ASUN, Sun Belt, Southland and Southern Conferences.
Between 1996 and 2008 Yeast was the National Coordinator of Baseball Umpires for the NCAA. In 1999 he was named Umpire of the Year by the International Baseball Federation.
Yeast served as the conference umpire coordinator for the Missouri Valley Conference from 1990 to 1994, the Metro Conference from 1993 to 1995, and Conference USA from 1996 to 1999. He umpired 25 Division I conference tournaments and 14 NCAA Regionals. He was an umpire during the NCAA College World Series in 1991 and 1995 and was involved with the NCAA baseball committee as it structured the officiating program for the NCAA playoff and World Series tournaments. In 2021, Yeast was the first ever umpire inducted into the College Baseball Hall of Fame.
Internationally, Yeast worked as an umpire for the 1996 Olympic Games, the 1993 and 1999 Intercontinental Cups, and the 1990 World Championships. In 1995 he also worked as an umpire for Major League Baseball.
He worked as an Instant Replay Communicator for the NFL from 2008 thru 2015, and as an Instant Replay Official for the Pac-12 Conference. He was selected to work the 2018 Tax Slayer Gator Bowl. In 2022, Yeast was named Supervisor of Football Instant Replay Officials for the Pac-12. In 2025, Yeast was hired by the NFL to serve as their Instant Replay Trainer.