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) Clallam Economic Alliance
11) CLARK COUNTY
12) COWLITZ PUD
13) Economic Alliance Snohomish County
14) Evergreen Forest Stewards
15) FEDEX
16) Food Northwest
17) INLAND POWER & LIGHT
18) Island County
19) Jaguar Transport Holdings LLC
20) LendingTree, LLC
21) Lewis County
22) Lewis PUD 01
23) McCain Foods USA, Inc
24) PACIFIC COAST SHELLFISH GROWERS ASSN
25) Palo Alto Networks
26) PISCES INTERNATIONAL
27) PORT BLAKELY
28) Port of Longview
29) Port of Pasco
30) PRA Group, Inc.
31) Puget Sound & Pacific Railroad
32) RELX INC
33) San Juan County
34) Skagit County
35) SNOHOMISH CO
36) TOTAL WINE & MORE
37) WA ASSN OF WHEAT GROWERS
38) WA GRAIN COMMISSION
39) WA OIL MARKETERS ASSN
40) WA POTATO & ONION ASSN
41) WA ST POTATO COMMISSION
42) Watco
43) 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: July 21, 2026
