About Us

Duffy Engineering & Associates, Inc. is a Structural, Engineering Design Firm located in St. Cloud, Minnesota, and primarily serves the central part of the state.

Our Mission

Our mission is to provide a single source solution while promoting all projects in the most cost effective and timely manner possible

As a full service, multi-disciplined consulting firm, Duffy Engineering builds lasting relationships with our clients by providing quality solutions and excellent service. Generally, our clients fit into one of these categories; Consulting, Developing, State and Local Governments, Cities or Towns. Including, developers, contractors, architects and homeowners.

Our Team

JOHN HOLT, PE

Structural Engineer

Education
Brigham Young University
Master of Science Civil Engineering, 1996
Provo, Utah

Utah Valley University
Bachelor of Science
Technology/Construction Management
Orem, Utah

Registrations
Arkansas
Florida
Minnesota
Utah
Wisconsin
South Dakota
North Dakota
Iowa

Qualifications/Experience

John Holt is Principal Engineer in Duffy Engineering & Associates Structural Engineering Group. He is a multi-versed engineer working on industrial, manufacturing, commercial, and residential projects.
With more than a decade of experience, John has extensive and efficient engineering skills that have achieved corporate goals and objectives involving:

  • Heavy steel structural engineering
  • Industrial material handling systems & support
  • Commercial and residential pre-cast concrete design
  • Efficiency improvement
  • Quality assurance & quality control
  • Field engineering and problem solving
  • Finite Element Analysis (FEA) software (RISA STAAD Pro, Ram Elements, & Solid works Simulation)
  • Project management and control
  • Forensic Engineering investigations and Inspections
  • Served as expert witness for damage assessment and insurance claims

John is a licensed professional engineer with wide ranging experience in the structural engineering and design of residential, commercial, and industrial projects of varying size and complexity while managing critical time and budget constraints.

Joel Ray, P.E.

STRUCTURAL ENGINEER

Education
University of Minnesota
MS, Structural Engineering 9/98 – 1/2001

St. Olaf College: BA 9/89 – 5/93

Registrations
Minnesota
Iowa

Qualifications/Experience

Joel is an experienced Structural engineer. He has worked in the curtainwall and components & cladding industries and has done engineering work for the Construction and building trades as well. He has gone through various training and has used AutoCAD, RISA, Excel, Word, PowerPoint, and other structural analysis software specific to glazing & curtain wall.

Joel has worked with a variety of codes and industry standards as well. These include; IRC IBC, ASCE Minimum Design Loads, National Design Standard for wood, AASHTO LRFD Bridge Design Manual, ANSI/TPI – NDS for wood truss, ASTM testing standards.

Joel is a Minnesota and Iowa licensed structural engineer. He has a successful and varied background in curtain wall engineering projects.