For Graham Cook, six years of semi-retirement was enough.

Cook, the former president of Cook’s Mechanical in Nashville, has joined the Alpha Energy Solutions’ Tennessee office as a sales representative specializing in HVAC work. Cook’s territory will include all of east Tennessee.

“I was tired of being retired,” Cook said during his orientation in Louisville in March. “I’m glad to be getting back to work and looking forward to seeing my contacts in the business.”

Cook joins a rapidly growing Tennessee operation for Alpha Energy Solutions that now includes six people. Alpha Energy Solutions Nashville base of operations just opened in 2012 and already has dozens of customers on annual maintenance contracts.

“In our experience, hiring an experienced professional like Graham is a great way to gain some momentum,” said Gerry Lewis, sales director for Alpha Energy Solutions. “We’re very optimistic about our growth in Nashville and throughout Tennessee.”