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 Aberdeen
5) City of Airway Heights
6) City of Battle Ground
7) City of Blaine
8) CITY OF COVINGTON
9) City of Ellensburg
10) CITY OF GIG HARBOR
11) City of Hoquiam
12) CITY OF ISSAQUAH
13) CITY OF KELSO
14) CITY OF KENMORE
15) City of La Center
16) CITY OF LAKE FOREST PARK
17) City of Lynden
18) City of Moses Lake
19) CITY OF MOUNTLAKE TERRACE
20) City of Newcastle
21) CITY OF PORT ORCHARD
22) CITY OF REDMOND
23) CITY OF TACOMA
24) CITY OF TOPPENISH
25) Clallam Economic Alliance
26) CLARK COUNTY
27) COWLITZ PUD
28) Economic Alliance Snohomish County
29) Evergreen Forest Stewards
30) FEDEX
31) Food Northwest
32) HIGHLINE COLLEGE
33) INLAND POWER & LIGHT
34) Innovia Foundation
35) Island County
36) Jaguar Transport Holdings LLC
37) LendingTree, LLC
38) Lewis County
39) Lewis PUD 01
40) McCain Foods USA, Inc
41) PACIFIC COAST SHELLFISH GROWERS ASSN
42) Pacific Lutheran University
43) Palo Alto Networks
44) PISCES INTERNATIONAL
45) PORT BLAKELY
46) Port of Longview
47) Port of Pasco
48) PRA Group, Inc.
49) Puget Sound & Pacific Railroad
50) RELX INC
51) San Juan County
52) Skagit County
53) SNOHOMISH CO
54) THERMO FISHER SCIENTIFIC, INC.
55) TOTAL WINE & MORE
56) Town of Yacolt
57) WA ASSN OF WHEAT GROWERS
58) WA GRAIN COMMISSION
59) WA OIL MARKETERS ASSN
60) WA POTATO & ONION ASSN
61) WA ST POTATO COMMISSION
62) Washington School Counselor Association
63) Watco
64) Whatcom Co
65) YAKIMA 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: January 22, 2026
