Our People

John Grinthal

Digital Marketing Specialist and Commercial Sales Manager

Between his studies at Rochester Institute of Technology, John scores sales for GVU. He's always strategizing new ways to expand our growing "empire."


Sean Callahan

Master Craftsman and Operations Manager

Sean enjoys candles, mathematics, and good company. He's especially good at taming big messes for a polished result - in the workshop and on spreadsheets.


Dan Grinthal

Business Manager and Product Designer

Dan is famous for making big, beautiful messes to launch projects, then asking everybody else to help him clean up. He handles the back-end stuff so the rest of the team has what they need to do the real work.