E91, formerly ENTEGEE is a stable business that has provided valued services for over two decades. Our commitment to a long term relationship with our clients is evident through our history.

  • 1986 — Founded in Davenport, Iowa, as a means for assisting clients faced with project overloads, backlogs and specialized requirements. We began recruiting and hiring technical professionals to work at client facilities on temporary bases.
  • 1991 — Opened our first Design Center in Dubuque, Iowa. This enabled us to provide our own experienced engineering personnel with their own equipment.
  • 1995 — Completed first large—scale, 1+ year engineering project.
  • 1997 — Opened second Design Center in Davenport, Iowa. Enabling us to attract more experienced personnel and expand our capabilities.
  • 2003 — Signed our 7th consecutive 2—year agreement with our initial client. We surpassed the 400,000 hours of engineering service for this client. Our total clients have grown to over 200 across North America.
  • 2007 — Dubuque Design Center moved to 3530 Digital Drive to accommodate growth. ENTEGEE surpasses 300 clients and has grown to 130 employees
  • 2010 — MPS Group is acquired by Adecco Group and joins Adecco Group North America as part of the Specialty Brands division.
  • 2011 — ENTEGEE builds an internal recruiting team to better serve our customer needs allowing us to quickly respond to needs in our Design Centers and at client sites.
  • 2013 — Davenport Design Center moves to 101 West 2nd Street to accommodate growth ENTEGEE acquires 2nd Romer Arm capable of laser scan technology, increasing efficiency of reverse engineering and inspection services.
  • 2015 — ENTEGEE is now E91 and surpasses 400 clients while growing to 300+ employees
  • 2022 — E91's sister division AP Engineering (St. Paul, MN Design Center) is rebranded to consolidate all three Design Center divisions under the E91 name. Our three Design Centers function as a single team and this allows current and future customers to identify with a single unified brand in the marketplace.


3530 Digital Drive
Dubuque, IA 52003


101 West 2nd St Suite 202
Davenport, IA 52801

St. Paul

St. Paul, MN