Patrick Callahan

Patrick Callahan is the CEO of Alquist 3D, a Greeley, Colorado company at the front of the 3D concrete printing industry. A West Point-era Army infantry officer turned defense-industry executive, he took the helm in October 2023 and steered the startup from emerging-technology curiosity into a commercial force, landing a landmark partnership with Walmart to 3D print store expansions across the country. He pairs two decades of defense business development - where he captured hundreds of millions in contracts at Critical Solutions International and AirBoss Defense Group - with a mission to make building faster, cheaper, and safer.