RK Steel
Overview
Strength Built Into Every Solution.
RK Steel combines structural steel expertise with advanced fabrication to deliver everything from traditional steel packages to complex multi-trade assemblies. Our integrated approach improves quality, streamlines installation and helps customers build smarter.
RK Steel has evolved beyond traditional structural steel construction to become an integrated fabrication partner for some of today’s most technically demanding projects.
While structural steel, miscellaneous metals and field erection remain core strengths, our capabilities have expanded to include increasingly sophisticated skidded systems, modular assemblies, equipment supports, multi-trade racks and integrated fabricated solutions that help customers shift more work into controlled production environments before it reaches the jobsite.
Our teams combine detailing, engineering coordination, fabrication, quality control, logistics and field installation to deliver solutions that improve quality, enhance safety and simplify construction in the field. By integrating multiple systems into prefabricated assemblies, we help customers reduce field labor, improve coordination and accelerate project delivery.
As customer needs continue to evolve, RK Steel continues to invest in advanced fabrication capabilities, modern production facilities and the skilled craft professionals who bring these solutions to life. The result is a trusted partner with the experience to execute traditional steel construction and the expertise to fabricate the integrated systems shaping the future of construction.
Solutions
From Structural Steel to Integrated Assemblies
While structural steel, miscellaneous metals and field erection remain core strengths, our capabilities have expanded to include increasingly sophisticated skidded systems, modular assemblies, equipment supports, multi-trade racks and integrated fabricated solutions that help customers shift more work into controlled production environments before it reaches the jobsite.
Multi-Trade Products
Building reliable infrastructure takes coordination, precision and the right partners. RK Steel helps simplify that process with custom, prefabricated multi-trade systems designed to integrate seamlessly with your project.
Structural
RK Steel combines structural steel expertise with advanced fabrication to deliver everything from traditional steel packages to complex assemblies.
Miscellaneous Metals
RK Steel fabricates and installs custom components with an integrated approach to detailing, fabrication, quality control and field installation improving coordination, safety and project efficiency.
- Get paid from day one while learning a skilled trade.
- Graduate debt-free with RK covering program costs.
- Receive hands-on training from experienced industry professionals.
- Earn college credits while building a rewarding career.
RK Steel Leadership
Donnie Hirschfield
President and General Manager
Donnie Hirschfield embarked on his professional journey in 1994 as a Project Engineer at RK Mechanical, and has held several positions within the organization. After serving as the Vice President of RK Mechanical, Donnie now assumes the role of President and General Manager at RK Steel. In this capacity, he plays a crucial role in shaping the vision, mission and overall direction of RK Steel, utilizing effective communication and implementation strategies.
Noteworthy projects Donnie has contributed to include the Rocky Mountain Regional VA Medical Center, Colorado Convention Center Hotel and McGregor Square, exemplifying his commitment to delivering outstanding outcomes. Donnie’s educational background features a Bachelor of Science degree in Construction Management from Colorado State University. He’s also a certified LEED AP and welding supervisor, highlighting his dedication to professional development.
Beyond work, Donnie finds joy in his marriage and cherishes quality time with his three sons and beloved chocolate lab, Ted. He embraces outdoor activities such as golfing, snowmobiling and immersing himself in the beauty of nature.
Jason McLachlan
Senior Vice President
Jason McLachlan’s journey in the industry began with an internship at RK in 2000. He officially joined RK Mechanical in 2001 and has held various positions over the years, currently serving as the Vice President of Operations for RK Steel. His previous roles with RK include Operations Manager, Senior Project Manager and Project Manager, showcasing his progressive leadership within the organization.
In his current role, Jason plays a pivotal part in overseeing day-to-day operations and providing strong industry leadership. Additionally, he focuses on fostering the growth of RK Steel, further elevating the company’s capabilities and reach.
Throughout his tenure, Jason has worked on a diverse range of projects, contributing to high-rise buildings and projects spanning hospitality, healthcare, data centers, education and office spaces. Noteworthy examples include the VA Medical Center, Dicks Sporting Goods Park, Viceroy Hotel and Ellie Caulkins Opera House.
Jason’s academic background includes a Bachelor of Science in Mechanical Engineering from the University at Buffalo. He also earned a LEED AP certification, demonstrating his commitment to sustainable and environmentally-conscious practices.
Beyond his professional achievements, Jason finds joy in family life, having been married since 2015 and being a proud father of two daughters and a son. When not immersed in work, he engages in various hobbies like volleyball, golf and hunting. Jason also contributes to the community as a member of the Westminster Rotary Club, engaging in impactful initiatives that make a difference in people’s lives.
Sean Crumplar
Vice President of Operations
Sean Crumplar grew up in the construction industry in Southern California, where his father was a general contractor. After several years working in the field, Sean earned a Bachelor of Science in Construction Management from California Polytechnic State University, San Luis Obispo. He went on to work for one of the country’s largest general contractors, building the experience that would shape his career in project leadership.
Sean managed projects for various general contractors from 1996 to 2009 before joining RK Mechanical as a Project Manager. He moved to RK Steel in 2013, serving as Senior Project Manager and later Operations Manager. In 2026, he became Vice President of Operations for RK Steel.
In his role as Vice President of Operations, Sean leads RK Steel’s construction group. He brings a lifelong passion for building to the work, along with an appreciation for the people in the industry and the problem solving that each day brings. His project experience includes the Aspen Art Museum, 1800 Larimer, the Monarch Hotel, the Ameristar Hotel, The Coloradan and the North Metro rail line.
Outside of work, Sean enjoys spending time with his wife and their three children. He also enjoys riding dirt bikes, hiking and taking on large projects around the house.
