But that changed last summer as he found his way back to his alma mater's athletic department.
"I wouldn't imagine it. Not in a million years," Carbin said. "I thought if the football thing didn't work out, I thought I was going to be a graphic designer working in Kansas City."
Carbin's worked throughout the 2013-2014 school year as Missouri Western Athletics' first coach dedicated solely to strength and conditioning. His work is giving the Griffs a leg up they've never had before as his focus stays in the weightroom.
"Just by talking to the coaches to see what we lacked whether it be strength, speed or whatever the case may from last season," Carbin said, "and put it into my workouts to try achieve a better trait or to gain strength or gain that speed."
Carbin's experienced winning at a high level, and the work it takes to get there. He was an All-MIAA defensive back at Missouri Western and helped guide the Griffons to the program's first playoff appearance as a senior in 2006.
Already in his short time at his new position, Carbin's making strides with various teams including the defending MIAA Champion baseball team.
"I think the work ethic that he's been able to build with what's important away from the field, I think it's going to be a big difference for us," head baseball coach Buzz Verduzco said.
Carbin's first year back in St. Joe coincided with his wife Marian's first year as head volleyball coach at Western. She led the Griffs to their best MIAA record since 2000 in her inaugural season. The career changes for both Greg and Marian are also benefiting their marriage.
"There were oftentimes where we would go through the week and we wouldn't even see each other," Greg said, "so this opportunity that I was presented with was a big time blessing and we took advantage."
Now in his new role at Missouri Western, Carbin's hoping to push Missouri Western closer to its ultimate goal.
"We're going to put all of that together with our teammates and other hard work that everyone puts in, and we're going to bring a national championship to Missouri Western whether it's volleyball, football, basketball. Whatever it is, we're going to bring more than one."