Wednesday, November 1, 2023

San Francisco-based structural engineering firm Degenkolb Engineers (Degenkolb) and Michigan-based structural engineering firm Ruby+Associates (Ruby) signed a Purchase Agreement and closed on an acquisition effective November 1, 2023. Ruby’s 55 employees will join Degenkolb, which will now have more than 330 employees in 10 offices.   

The Michigan-based team will operate as Ruby+Associates, a Degenkolb Company. With Ruby’s engineering licenses in 42 states, the District of Columbia, and three Canadian provinces, the company’s combined forces will have a much broader geographical reach. The acquisition expands Degenkolb’s presence beyond the western United States for the first time in its 83-plus year history.  

Stacy Bartoletti, CEO of the combined firm, said of the acquisition, “I have known leaders at Ruby for more than a decade, and we have partnered in different aspects of our business for multiple years. Our cultures align around giving opportunities to our employees and providing exceptional client service. The combined firm will grow more together than each firm would have on its own.” 

Ruby+Associates is a 39-year old structural engineering firm headquartered in Bingham Farms, Michigan (metro Detroit), with a focus on steel construction and construction engineering services. Tricia Ruby has served as CEO since 2011.  

“We are both proud of the firms that we’ve built. Our people are invested in our identities. The opportunities that this will provide to our existing employees and new hires are incredible. There will be flexibility in location, in markets to serve, and in clients to work with in the future,” said Tricia Ruby, Principal and Group Director at the newly combined firm.  

Marketing Kit available. Contact Michelle McCulloch at

  • Video file 
  • Bartoletti headshot 
  • Ruby headshot 
  • Ruby logo 
  • Degenkolb logo 


Founded in 1940, Degenkolb Engineers’ practice reflects more than eight decades of commitment to technical expertise, exceptional client service through close collaboration, and life-long learning.  

Since its founding in 1984, Ruby+Associates Structural Engineers has focused on constructability, with service to the steel construction industry. 


30300 Telegraph Road, Suite 400
Bingham Farms, MI 48025
220 Lyon Street NW, Suite 540
Grand Rapids, MI 49503