Moseley worked mostly behind the scenes with Greenbrier athletic director and softball coach Garrett Black for 11 years to help lead the Wolfpack to multiple state and region championships.
"All of last week I was going through and trying to get ready for ... our upcoming parent meeting," Black said Monday. "During that whole process, it hit me that I never realized how much Mark did for us and our softball program."
Moseley's duties included organizing meetings, fundraisers, cookouts and work days; keeping player statistics and scouting charts; and booking hotel reservations when the team traveled.
Moseley also served as the school's booster club president and kept time during home basketball games.
"Mark had his hands in a lot of cookie jars," Black said.
In June 2007, Moseley was diagnosed with colon cancer. Despite treatment, the cancer eventually spread to his liver.
"It's going to be hard to find somebody to replace Mark," Black said. "In fact, he's irreplaceable."
A public memorial will be held at 11 a.m. Saturday at First Baptist Church of Augusta on Walton Way Extension.