Company leader
Trey Holterman
Co-founder and CEO
Tennr
Trey Holterman is co-founder and chief executive of Tennr, a company in New York City, New York, whose software reads incoming patient referrals and gets them ready to schedule. A specialty practice uses it so its staff stop retyping faxed referrals and chasing missing insurance details. He is a former Stanford rower who took the idea from his mother, a family doctor.
Rowing at Stanford
He studied computer science at Stanford University, where he was a teaching assistant and captained the rowing team. For nine years of rowing he woke at 4:08 a.m. one day and 5:25 a.m. the next. "I was very used to this idea that discipline leads to a good outcome," he said. After college he worked as a software engineer at Health IQ, a Medicare platform, in 2019 and then at Strava, the fitness app, from 2020 to 2021.
Listening to His Mother
He met Tyler Johnson and Diego Baugh at Stanford as engineering students working on AI research. His mother, who works in family medicine, had long called referrals a "black hole," and the three founded Tennr in 2021 to fix them. "The moral of the story for me is, always just listen to your mom," he said. The early team took Zoom calls from his parents' basement and coded for months between customer conversations, which he believes cost them a couple of extra years.
Once customers arrived, Tennr said yes to everything. As sales approached a million dollars he ordered Converse sneakers for all ten employees, and two days before they arrived the team decided it could not support so many uses and cut back to referrals. "I was so stressed I just thought, 'It better be,'" he said of that moment. Tennr trained its own model on tens of millions of medical documents, and IVP led a $101 million Series C in June 2025, eight months after its Series B.