Why Choose Garrett-Ihnen


Our mission is to exceed the client’s expectations through personal service and professional engineering.



That’s how we measure success!



A project manager engineer personally serves you. Phone calls and emails are returned within 3 hours.


Professional Engineering

We offer expertise, quality, innovation and technology.

Our Mission

To exceed the client's expectations through personal one-on-one service and professional engineering.

Our People

At Garrett-Ihnen Civil Engineers, we specialize in commercial and residential site development throughout the Greater Austin area and the Texas Hill Country. 


Steven L. Ihnen, P.E.
Regional Manager

Steve Ihnen serves as Regional Manager of Garrett-Ihnen Civil Engineers. As the engineer of record for most of the firm's projects, Mr. Ihnen has design oversight and review of projects managed by other associates of the firm. In addition, Mr. Ihnen provides project management for many large scale and multi-phase projects and performs civil and drainage design. Mr. Ihnen's experience includes on-site construction field management that brings a real world aspect and view to the design table. His experience with a wide range of projects from public works, residential and commercial affords the Garrett-Ihnen team the technical support needed to produce a high quality cost effective design.

Mr. Ihnen has designed several projects requiring multiple municipality and state reviews. Through his involvement in professional associations at the board of directors and committee levels, Mr. Ihnen has established a good working relationship with local authorities and is aware of development issues in a dynamic environment. He graduated from Texas A&M University in College Station with a Bachelor of Science in Civil Engineering and is registered in the State of Texas as a Professional Engineer.


Jason Rodgers, PE
Assistant Regional Manager

Kenny Watkins, PE
Project Manager

Jevon Poston, PE
Project Manager

Peter Dueno, PE
Project Manager

Julio Escobedo
Engineer in Training

Sarah Lee
Engineer in Training

Conan Witzel
Senior Designer

Thomas Acosta

Jim Wilson

Chris Shaleesh

Lisa Foret
Drafting Technician

Alexis Estrada
Drafting Technician

Bryan Varvel
Drafting Technician

Thomas Acosta

Lisa Foret
Drafting Technician

Mike Wilson
Business Development

Norma Divine
Processing & Permitting

Marilynn Anthenat
Accounting & Human Resources

Kathy Ihnen
Administrative Services

Jennifer Walker

Our History: Jack Garrett and Steve Ihnen

Here at Garrett-Ihnen Civil Engineers, we fondly remember Jack Garrett. Our founder, Dr. Jack Taylor Garrett, Jr. was born in Knoxville, Tennessee, on October 31, 1948. He was a veteran of the U.S. Army, graduate of the University of Missouri and received his PH.D. in Civil Engineering from The University of Texas at Austin.

In 1987, he joined the parent firm of AB Engineering and nine years later he bought the company from Alan Abbe and became the sole stockholder. In January 1997, he changed the company name to Garrett/Associates Engineering, Inc. His management philosophy was to empower his employees to provide excellent service. This philosophy nurtured a team of professionals that has the confidence and ability to carry on the company’s design and production that continues to this day.

Every January, we mark the anniversary of Jack’s passing. He suffered a fatal heart attack at the age of 49 at his home in 1998.

After Jack's passing, Steve Ihnen stepped forward and soon bought the company from Jack’s heirs.

Today, Mr. Ihnen serves as President of Garrett-Ihnen Civil Engineers and he continues to expand Jack’s legacy and reflect the personal and professional qualities that inspire us to continually strive for excellence. 

As our company continues to grow, we regret that our newer employees never had the pleasure of experiencing Jack Garrett's leadership. And not a day goes by that we don’t wish Jack was still with us and enjoying our success and camaraderie.


Garrett-Ihnen Civil Engineers is currently accepting applications for the following positions: 

E.I.T. Civil Engineering
Experience with site development, water/wastewater systems, traffic control, SWPPP using AutoCAD and Civil 3D. Full-time, benefits. B.S. Civil Engineering required. Send resume to mka@gice.us

AutoCAD Designer
Experience with site development, water/wastewater systems, traffic control, SWPPP, lot layouts using AutoCAD and Civil 3D. Full-time, benefits. Send resume to mka@gice.us