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.
Dan@greenvalleyupcycling.com