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 KENNEWICK

21) CITY OF KENT

22) City of La Center

23) CITY OF LAKE FOREST PARK

24) CITY OF LAKEWOOD

25) CITY OF LONGVIEW

26) City of Lynden

27) City of Lynnwood

28) City of Medical Lake

29) City of Moses Lake

30) CITY OF MOUNTLAKE TERRACE

31) City of Newcastle

32) City Of Othello

33) CITY OF PASCO

34) CITY OF PORT ORCHARD

35) CITY OF REDMOND

36) CITY OF SEATAC

37) City of Spokane Valley

38) City of Sultan

39) CITY OF TACOMA

40) CITY OF TOPPENISH

41) CLARK COUNTY

42) Consumer Brands Association

43) COWLITZ PUD

44) Economic Alliance Snohomish County

45) Evergreen Forest Stewards

46) FEDEX

47) Food Northwest

48) GOODWILL OF THE OLYMPICS & RAINIER REGION

49) Greater Grays Harbor, Inc

50) Haploos Inc

51) HIGHLINE COLLEGE

52) INLAND POWER & LIGHT

53) Innovia Foundation

54) Island County

55) Jaguar Transport Holdings LLC

56) LendingTree, LLC

57) Lewis County

58) Lewis PUD 01

59) McCain Foods USA, Inc

60) MGA Home Healthcare Washington LLC

61) North Olympic Legislative Alliance

62) PACIFIC COAST SHELLFISH GROWERS ASSN

63) Pacific Lutheran University

64) Palo Alto Networks

65) PIERCE TRANSIT

66) PISCES INTERNATIONAL

67) PORT BLAKELY

68) Port of Hoodsport

69) Port of Longview

70) Port of Pasco

71) PRA Group, Inc.

72) Puget Sound & Pacific Railroad

73) RELX INC

74) Roblox

75) San Juan County

76) Skagit County

77) SNOHOMISH CO

78) SSMCP

79) Team Select Home Care

80) THERMO FISHER SCIENTIFIC, INC.

81) TOTAL WINE & MORE

82) Town of Yacolt

83) WA ASSN OF WHEAT GROWERS

84) WA GRAIN COMMISSION

85) WA OIL MARKETERS ASSN

86) WA POTATO & ONION ASSN

87) WA ST POTATO COMMISSION

88) Washington School Counselor Association

89) Watco

90) Whatcom Co

91) Whatcom Transportation Authority

92) 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: July 17, 2025