---
title: United Mechanical Service Team Members
---

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# Meet Our Team

 Donohue Commercial Service

#### [![Our Team - Zach Willoughby](https://donohue.unitedmech.com/hubfs/DSC04579_final-Edit%20(1)-1.jpeg) Zach Willoughby General Manager](https://donohue.unitedmech.com/our-team/dcs/zach-willoughby)

As General Manager of Donohue Commercial Service, Zach Willoughby provides strategic leadership backed by more than 10 years of commercial HVAC experience and over 20 years in t...

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 Donohue Commercial Service

#### [![Our Team - Tyson Anthony](https://donohue.unitedmech.com/hubfs/Headshots/Tyson%20-%20Regular-1-1.jpeg) Tyson Anthony Service Manager](https://donohue.unitedmech.com/our-team/dcs/tyson-anthony)

Tyson Anthony serves as Service Manager for Donohue Commercial Service in Tulsa, Oklahoma. With more than 20 years of HVAC experience, Tyson brings extensive technical expertise...

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 United Mechanical Service  
 United Mechanical Construction  
 Donohue Commercial Service

#### [![Our Team - Brandon Mack](https://donohue.unitedmech.com/hubfs/Headshots/Headshots%202025/Brandon%20Mack%202025.jpg) Brandon Mack Controller](https://donohue.unitedmech.com/our-team/dcs/brandon-mack)

A graduate of Southwestern Oklahoma State University with a degree in finance, Brandon Mack is the Controller at Unite...

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 Donohue Commercial Service

#### [![Our Team - Jon Heaps](https://donohue.unitedmech.com/hs-fs/hubfs/jonhheaps-1-500x500.jpg?width=500&name=jonhheaps-1-500x500.jpg) Jon Heaps Senior Account Manager](https://donohue.unitedmech.com/our-team/dcs/jon-heaps)

Jon is our senior HVAC/R Maintenance Professional with over 30 years of experience. He is capable of designing preventative maintenance programs that are customized to meet individ...

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 Donohue Commercial Service

#### [![Our Team - Darryl Adams](https://donohue.unitedmech.com/hs-fs/hubfs/darryladams-500x500.jpg?width=500&name=darryladams-500x500.jpg) Darryl Adams Project Manager / Sales](https://donohue.unitedmech.com/our-team/dcs/darryl-adams)

No info.

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 Donohue Commercial Service

#### [![Our Team - Chris Clark](https://donohue.unitedmech.com/hubfs/Chris-Clark-500x50.png) Chris Clark Maintenance Sales](https://donohue.unitedmech.com/our-team/dcs/chris-clark)

Joined Donohue Commercial Service in 2023, prior to that he served in maintenance sales for United Mechanical Service for 7 years. Chris has over 25 years experience in customer...

[Read More](https://donohue.unitedmech.com/our-team/dcs/chris-clark)

 Donohue Commercial Service

#### [![Our Team - Jessica Wollard](https://donohue.unitedmech.com/hubfs/Headshots/Jessica%20-%20Regular.jpeg) Jessica Wollard Maintenance Sales](https://donohue.unitedmech.com/our-team/dcs/jessica-wollard)

With more than two decades of customer service and sales experience, Jessica brings a relationship-first approach to commercial HVAC preventative maintenance. After buildi...

[Read More](https://donohue.unitedmech.com/our-team/dcs/jessica-wollard)

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