Architecture Engineering

Leadership in Arizona Architecture & Engineering

At GLHN, we believe our success comes from helping others succeed. Since 1963, we’ve been delivering a full range of innovative, integrated design solutions to clients throughout Arizona and beyond. We thrive on complex design challenges that allow us to apply our creativity and work in partnership with our clients.

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Environment & Natural Resources 2 (ENR2) Building

The University of Arizona, Tucson, AZ
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Satellite Chilled Water Plant

New Mexico State University, Las Cruces, NM
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St. Joseph’s Hospital Third Avenue Parking Garage Expansion

Dignity Health, Phoenix, AZ
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Our Team

Our employee-owners include a wide variety of certified professionals who bring their skills, dedication, expertise, and commitment to every project. We build long-term client partnerships designed to ensure our mutual success.

Donna
Mertes,
PE

President

Bill
Koller,
PE

Director of Mechanical Engineering

John
McGann,
PE

Director of Civil Engineering

Russ
Combs,
AIA

Director of Architecture

Tiffany
Gorrell

Director of Business Development + Marketing

Stanley
Yellowhair,
PE

Department Manager of Mechanical, Electrical, and Plumbing Engineering

we are looking for inspiring people to join our team. Is that you?

The Newest

Exploring LEED v5 with the University of Arizona: A Shift Toward Carbon-Conscious Design

August 4, 2025

by Joyce Kelly RA, CCP, CxA+BE, LEED AP BD+C   GLHN is discussing the incorporation of innovative design standards with the University of Arizona to align with the USGBC’s new LEED v5 framework. The focus is on using the enhanced energy efficiency prerequisites in LEED v5 to significantly reduce operational energy consumption and lower operations and maintenance costs for the university. Compared to LEED v4, which primarily emphasized energy cost…

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Rainwater Harvesting in Tucson

January 26, 2024

Implementing Rainwater Harvesting in Tucson By Madeline McCaskill + Joyce Kelly, RA, NCARB, CCP Here in Tucson, water is a sacred resource. Rain often serves as relief for the dry Sonoran Desert but unfortunately Tucson only has two seasons: a monsoon in the summer and smaller scattered storms in the winter. The summer season lasts from July to September and the winter one is in December and January. The driest…

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The Art & Science of Building Enclosure Design Reviews

December 7, 2023

The Art & Science of Building Enclosure Design Reviews By Joyce Kelly, RA, NCARB, CCP, GLHN + Kelly Rice, Intertek Successful commissioning of a project’s building enclosure requires an intentionally executed design review phase.  This crucial first step in the construction process establishes and reinforces owner expectations. Control layer performance, energy efficiency, indoor air quality, environmental impact, security, operability, durability, and cost are all addressed. The skills required “to establish”…

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