DIANA CARLEN

DIANA CARLEN

( Washington,  )

GORDON THOMAS HONEYWELL GOV AFFAIRS

Introduction

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.

Client List  Number of Years as a Lobbyist  Biography 
Clients

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

Number of Years as a Lobbyist

6-10 years

Biography

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