Experience, visionary thinking, and a shared commitment to client-focused project delivery.

Josh Helgesen

CEO & Principal

Josh is a natural leader committed to excellence. He values collaboration and mutual respect, recognizing success as a team effort. With a focus on quality, integrity, inclusivity, and client satisfaction, Josh guides the company forward, embracing learning and growth.

Tom Hochstaetter

CFO & Principal

Tom has an incredible will to succeed. That is a real advantage to his clients who quickly learn that Tom will do everything he can to give them what they need - no matter what the challenge. With a wealth of experience in financial management, planning, and risk mitigation, Tom plays a pivotal role in driving strategic financial decisions.

Kate Carlson

Administrative Director

As Administrative Director, Kate's role touches every facet of Greiner's work. She holds two decades of institutional knowledge and ensures a strong foundation and culture of excellence throughout the company. Kate manages multiple departments and corporate initiatives, setting a high bar for every team she leads.

Hans Siefker


Hans believes in reinforcing a culture where teamwork, collaboration, fun, and personal growth are staples of the company culture. Leading by example, he promotes an environment that encourages everyone to do the best they can, with a focus on delivering outstanding customer service and actively listening to understand the needs of each client.  

Spencer Finseth


Spencer is a visionary, always looking toward the future of the industry. His favorite part of the job is empowering clients through education and partnership. Spencer is a passionate advocate for increasing equity and inclusion in construction, and he serves on the boards of several nonprofits throughout the Twin Cities.

Josh Miltenberger

Chief Operating Officer

As COO, Josh brings a wealth of experience and passion for leadership in project management. He is committed to creating a work environment grounded in collaboration, innovation, and fun.  He plays a pivotal role in setting the tone for Greiner's operations, reflecting our approach to both work and life.