Continuing its upward trajectory, ISG has made significant strides in the competitive architecture and engineering sector, recently climbing eight spots to secure the #245 position in Engineering News-Record's (ENR) 2025 Top 500 Design Firms list. This recognition underscores the firm’s commitment to delivering innovative solutions across a diverse range of markets.
Founded over 50 years ago, ISG is a full-service architecture, engineering, environmental, and planning firm based in Mankato, Minnesota. As a 100% employee-owned company, ISG fosters a culture of accountability and growth, with each team member actively involved in the firm's success. This unique structure not only enhances employee engagement but also drives the firm’s strategic initiatives.
ISG serves 12 distinct markets, encompassing both public and private sectors, which allows the firm to maintain flexibility and adaptability in its operations. By integrating its various practice groups, ISG can offer fully integrated services tailored to meet the specific needs of its clients. “Being recognized by ENR is not only a reflection of the incredible work our teams do every day—it's also a signal of where we're headed,” said ISG President David Doxtad, PE. “As we continue to grow, we will create more opportunities for our people, attract even more top-tier talent, and expand our impact with clients across all markets. I'm energized by our growth and excited for what's next.”
The firm’s recent achievements are part of a broader strategy that includes both organic growth and strategic investments in key markets. Over the past 18 months, ISG celebrated its 50th anniversary, a milestone that coincided with significant expansions in its physical footprint. The firm has recently moved into a new space within Cherapa Place in Sioux Falls, South Dakota, a development that ISG played a crucial role in designing.
In addition to the Sioux Falls location, ISG has opened new offices in Rogers, Arkansas; Pierre, South Dakota; and Dakota Dunes, South Dakota. These expansions reflect ISG's intentional approach to growth, aimed at enhancing its geographic presence and service offerings. The firm's upward movement in the ENR Top Design Firms list is a testament to its mission of making a difference in the communities it serves.
With more than 500 professionals working across various offices in Iowa, Minnesota, Wisconsin, South Dakota, and Arkansas, ISG is well-positioned to tackle a wide array of projects. The firm’s commitment to excellence and its strategic focus on collaboration across practice groups enable it to deliver comprehensive solutions that meet the evolving needs of its clients.
As ISG continues to grow, it remains dedicated to fostering a positive work environment and nurturing talent within its ranks. The firm’s employee ownership model not only empowers its workforce but also aligns the interests of employees and clients alike, creating a shared vision for success.
ISG’s recognition by ENR highlights the firm’s ongoing efforts to innovate and adapt in a rapidly changing industry. The firm’s leadership is optimistic about the future, anticipating that its growth will lead to new opportunities and further enhancements in service delivery.
In conclusion, ISG's recent achievements, including its rise in the ENR rankings and expansion into new markets, position the firm for continued success. With a strong foundation built on employee ownership and a commitment to client satisfaction, ISG is poised to make an even greater impact in the architecture and engineering sectors.
