DIANA CARLEN
GORDON THOMAS HONEYWELL GOV AFFAIRS
dcarlen@gth-gov.com
(253) 620-6636
1201 Pacific Avenue, Suite 2100, Tacoma, WA, 98401,
Subjects: Agencies/Regulations, Alcohol, Animals/Agriculture, Appropriations/Budgets, Business/Commerce, Consumer Protection, Energy/Utilities, Environment/Recycling, Finance/Banking, Food/Restaurants, Health Care, Housing/Real Estate/Development/Construction, Insurance, Manufacturing, Medicare/Medicaid, Pharmaceuticals, Planning/Land Use/Zoning, Privacy/Internet, Professional/Vocational Licensing, Public Sector, Retail, RFP/Procurement, Science/Technology, Taxes, Telecommunications, Tourism/Hospitality, Transportation/Vehicles
Links: Website
Diana Carlen is a Vice President at Gordon Thomas Honeywell Governmental Affairs (GTH-GA), the state's largest comprehensive governmental affairs firm. GTH-GA is information-driven and non-partisan. Diana represents a broad group of clients before the state legislature, state agencies, and the executive branch.
1) Bamboo Health
2) Benton County Commissioners
3) Cascade Water Alliance
4) City of Battle Ground
5) City of Ellensburg
6) CITY OF ISSAQUAH
7) CITY OF LAKE FOREST PARK
8) City of Moses Lake
9) CITY OF MOUNTLAKE TERRACE
10) CITY OF REDMOND
11) Clallam Economic Alliance
12) CLARK COUNTY
13) COWLITZ PUD
14) Economic Alliance Snohomish County
15) Evergreen Forest Stewards
16) FEDEX
17) Food Northwest
18) INLAND POWER & LIGHT
19) Innovia Foundation
20) Island County
21) Jaguar Transport Holdings LLC
22) LendingTree, LLC
23) Lewis County
24) Lewis PUD 01
25) McCain Foods USA, Inc
26) PACIFIC COAST SHELLFISH GROWERS ASSN
27) Palo Alto Networks
28) PISCES INTERNATIONAL
29) PORT BLAKELY
30) Port of Longview
31) Port of Pasco
32) PRA Group, Inc.
33) Puget Sound & Pacific Railroad
34) RELX INC
35) San Juan County
36) Skagit County
37) SNOHOMISH CO
38) TOTAL WINE & MORE
39) WA ASSN OF WHEAT GROWERS
40) WA GRAIN COMMISSION
41) WA OIL MARKETERS ASSN
42) WA POTATO & ONION ASSN
43) WA ST POTATO COMMISSION
44) Watco
45) Whatcom Co
6-10 years
Diana Carlen leads the firm's business and utility practice and has over 20 years of legal and legislative experience. Prior to joining Gordon Thomas Honeywell Governmental Affairs, Diana served as Leadership Counsel to the Senate Republican Caucus. In that role, she also served as the caucus attorney for the following policy issues: energy, natural resources, agriculture, land use, telecommunications and water issues. Prior to working for the Senate, Diana practiced law for several years focusing on land use and environmental issues and also served as a Law Clerk to Chief Justice Gerry Alexander of the Washington State Supreme Court. Diana represents several of the firm's business clients, public utilities, and port clients.
Last Updated: February 17, 2026
