What departments does Guernsey have?

Guernsey has employees across 15 departments including Business Development, Solutions Engineering, Finance, Program & Project Management, Information Technology.

What is the largest department at Guernsey?

The largest department at Guernsey is Engineering with 7 employees.

Where are Guernsey employees located globally?

Guernsey has employees across 5 continents and 5 countries including South Africa, United Kingdom Of Great Britain And Northern Ireland, United States Of America, Australia, Guernsey.

How has Guernsey's team size changed over time?

Guernsey's team has grown from approximately 142 to 146 employees based on available data.

Guernsey Employee Directory

Architecture and PlanningOklahoma, United States51-200 Employees

Guernsey is a mid-sized, multidisciplinary design and consulting firm based in Oklahoma City, Oklahoma. Founded in 1928, it operates on five continents and offers a broad mix of architecture, engineering, economic and management consulting, environmental and transportation planning, and cybersecurity services. The firm emphasizes sustainability and aims to improve the built environment through integrated, cross-disciplinary work, and it is fully owned by its employees, reflecting an entrepreneurial, culture-driven approach. Guernsey serves clients across diverse industries with planning, design, and advisory capabilities that address complex infrastructure needs. Recent developments include collaborations with Siemens on electricity strategy, with HoganTaylor LLP to expand cybersecurity maturity services, and a city planning engagement with the City of Cushing.

Guernsey Global Highlights

North America
307

United States Of America
307

Europe
5

United Kingdom Of Great Britain And Northern Ireland
5

Africa
1

South Africa
1

Oceania
1

Australia
1

Guernsey's Leadership

H. A.
Vice President Energy & Utility Solutions
Mobile Phone
Email
H. G.
President
Mobile Phone
Email
J. B.
President
Mobile Phone
Email
M. G.
President
Mobile Phone
Email
L. M.
Owner
Mobile Phone
Email
M. D.
Vice President
Mobile Phone
Email
D. O.
Ae Business Development Director, Vice President
Mobile Phone
Email
D. M.
Senior Vice President
Mobile Phone
Email

Guernsey Employee Metrics

100%

50%

0%

2026

2025

Arts & Design
Engineering
Information Technology
Program & Project Management
Consultant
Other
Information Security

Contact profiles from Guernsey

Name

Title

Contact

Location

Last Update

H. G.
President
Mobile Phone
Email
Oct 16, 2024
J. B.
President
Mobile Phone
Email
Oct 22, 2024
L. M.
Owner
Mobile Phone
Email
Oct 17, 2024
M. G.
President
Mobile Phone
Email
Oct 22, 2024
M. D.
Vice President
Mobile Phone
Email
Aug 06, 2026
D. O.
Ae Business Development Director, Vice President
Mobile Phone
Email
Oct 22, 2024
D. M.
Senior Vice President
Mobile Phone
Email
Oct 24, 2024
H. A.
Vice President Energy & Utility Solutions
Mobile Phone
Email
Oct 17, 2024
P. D.
Vice President
Mobile Phone
Email
Oct 17, 2024
S. H.
Senior Vice President, Energy And Utility Solutions
Mobile Phone
Email
Oct 18, 2024

Frequently Asked Questions

What is Guernsey known for?

Guernsey was founded in 1928 and operates in the Architecture and Planning industry. You can contact Guernsey's main corporate office by phone at

+1-405-416-****

. Explore Guernsey's company overview page for more information.

What is Guernsey's most common email format?

Guernsey employees' email format typically follows the pattern of First.Last@guernsey.us. Trying to find reliable and up-to-date employee contact data? Find more Guernsey email formats with LeadIQ.

How many employees does Guernsey have currently?

Guernsey has approximately 177 employees as of August 2026. These team members are located across 4 continents, including North America, Europe and Africa.

Who are Guernsey's key employees and leadership?

As of August 2026, Guernsey's key employees include:

Vice President Energy & Utility Solutions: H. A.
President: H. G.
President: J. B.
President: M. G.
Owner: L. M.

Looking for contact data? Unlock accurate emails and phone numbers for your ideal prospects with LeadIQ.

Everything for prospecting,
in one platform.

What you can expect from LeadIQ:

B2B data verified in real-time
Sync data to your CRM, & add it to an outreach sequence in one click
Integrations with your tech stack for optimal efficiency
A patented AI cold email generator
Account & contact-level job change tracking

Guernsey Employee Directory

Find Guernsey employees' phone numbers or email addresses

Name search is limited — try advanced search instead