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.

Clients

1) #1A LifeSafer

2) 1A Smart Start LLC

3) Bamboo Health

4) Benton County Commissioners

5) Cascade Water Alliance

6) City of Aberdeen

7) City of Airway Heights

8) City of Bainbridge Island

9) City of Battle Ground

10) CITY OF BELLEVUE

11) City of Blaine

12) City of Bothell

13) CITY OF COVINGTON

14) City of Ellensburg

15) CITY OF GIG HARBOR

16) City of Hoquiam

17) CITY OF ISSAQUAH

18) CITY OF KELSO

19) CITY OF KENMORE

20) CITY OF KENT

21) City of La Center

22) CITY OF LAKE FOREST PARK

23) CITY OF LAKEWOOD

24) CITY OF LONGVIEW

25) City of Lynden

26) City of Lynnwood

27) City of Moses Lake

28) CITY OF MOUNTLAKE TERRACE

29) City of Newcastle

30) City Of Othello

31) CITY OF PASCO

32) CITY OF PORT ORCHARD

33) CITY OF REDMOND

34) CITY OF SEATAC

35) City of Sultan

36) CITY OF TACOMA

37) CITY OF TOPPENISH

38) CLARK COUNTY

39) Consumer Brands Association

40) COWLITZ PUD

41) Economic Alliance Snohomish County

42) Evergreen Forest Stewards

43) FEDEX

44) Food Northwest

45) GOODWILL OF THE OLYMPICS & RAINIER REGION

46) Greater Grays Harbor, Inc

47) Haploos Inc

48) HIGHLINE COLLEGE

49) INLAND POWER & LIGHT

50) Innovia Foundation

51) Island County

52) Jaguar Transport Holdings LLC

53) LendingTree, LLC

54) Lewis County

55) Lewis PUD 01

56) McCain Foods USA, Inc

57) MGA Home Healthcare Washington LLC

58) North Olympic Legislative Alliance

59) PACIFIC COAST SHELLFISH GROWERS ASSN

60) Pacific Lutheran University

61) Palo Alto Networks

62) PISCES INTERNATIONAL

63) PORT BLAKELY

64) Port of Hoodsport

65) Port of Longview

66) Port of Pasco

67) PRA Group, Inc.

68) Puget Sound & Pacific Railroad

69) RELX INC

70) San Juan County

71) Skagit County

72) SNOHOMISH CO

73) SSMCP

74) Team Select Home Care

75) THERMO FISHER SCIENTIFIC, INC.

76) TOTAL WINE & MORE

77) Town of Yacolt

78) WA ASSN OF WHEAT GROWERS

79) WA GRAIN COMMISSION

80) WA OIL MARKETERS ASSN

81) WA POTATO & ONION ASSN

82) WA ST POTATO COMMISSION

83) Washington School Counselor Association

84) Watco

85) Whatcom Co

86) Whatcom Transportation Authority

87) YAKIMA 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: August 26, 2025