Every year since 2000, The Zweig Letter has recognized the fastest-growing architecture, engineering, and environmental consulting firms on the basis of percentage growth and dollar growth. Over the years, the "Hot Firm" designation has become synonymous with success in the industry.

The Zweig Letter Hot Firm List of the 200 fastest-growing firms for 2008 appears below. The winning firms were honored at a special award ceremony during The Zweig Letter Hot Firm 2008 Conference. The ranking by size and by type of work was also acknowledged at the conference.

  1. WSP Group (USA) (New York, NY)
  2. Hill International, Inc. (Marlton, NJ)
  3. ARCADIS U.S., Inc. (Highlands Ranch, CO)
  4. NELSON (Philadelphia, PA)
  5. Natural Resource Group, LLC (Minneapolis, MN)
  6. TolTest, Inc. (Maumee, OH)
  7. Stantec Consulting Inc. (Irvine, CA)
  8. X-nth (Maitland, FL)
  9. ITAC Engineers & Constructors (Chester, VA)
  10. Trow Global Inc. (Brampton, ON)
  11. ENGlobal (Houston, TX)
  12. Cubellis (Boston, MA)
  13. Vector Engineering, Inc. (Grass Valley, CA)
  14. River Consulting, LLC (Columbus, OH)
  15. Lawrence Group (St. Louis, MO)
  16. Perkins+Will (Chicago, IL)
  17. JBA Consulting Engineers (Las Vegas, NV)
  18. gkkworks (Irvine, CA)
  19. EYP Mission Critical Facilities, a company of HP (New York, NY)
  20. Perkins Eastman (New York, NY)
  21. ENTACT (Grapevine, TX)
  22. FXFOWLE ARCHITECTS (New York, NY)
  23. OZ Architecture (Boulder, CO)
  24. SB Architects (San Francisco, CA)
  25. Jacques Whitford Ltd. (Dartmouth, NS)
  26. Golder Associates (Atlanta, GA)
  27. HDR (Omaha, NE)
  28. Bury+Partners, Inc. (Austin, TX)
  29. Engineering/Remediation Resources Group (Concord, CA)
  30. Kimley-Horn and Associates, Inc. (Raleigh, NC)
  31. Terracon Consultants, Inc. (Olathe, KS)
  32. FRCH Design Worldwide (Cincinnati, OH)
  33. Callison (Seattle, WA)
  34. McKim & Creed, PA (Raleigh, NC)
  35. Sovereign Consulting Inc. (Robbinsville, NJ)
  36. Structural Integrity Associates, Inc. (San Jose, CA)
  37. E M C Engineers, Inc. (Lakewood, CO)
  38. Ghafari Associates, LLC (Dearborn, MI)
  39. DCI Engineers (Bellevue, WA)
  40. SSOE, Inc. (Toledo, OH)
  41. Core States Group (Duluth, GA)
  42. ARRAY Healthcare Facilities Solutions (King of Prussia, PA)
  43. Schnabel Engineering, Inc. (Glen Allen, VA)
  44. LAI Engineering (Marietta, GA)
  45. Crafton Tull Sparks (Rogers, AR)
  46. EN Engineering, LLC (Woodridge, IL)
  47. SGC Engineering, LLC (Westbrook, ME)
  48. Allana Buick & Bers, Inc. (Palo Alto, CA)
  49. Hnedak Bobo Group, Inc. (Memphis, TN)
  50. Perkowitz+Ruth Architects (Long Beach, CA)
  51. Thornton Tomasetti (New York, NY)
  52. Vocon. (Cleveland, OH)
  53. Potomac-Hudson Engineering, Inc. (Bethesda, MD)
  54. KJWW Engineering Consultants (Rock Island, IL)
  55. LS3P ASSOCIATES LTD. (Charleston, SC)
  56. Apex Companies, LLC (Rockville, MD)
  57. TEAM Integrated Engineering, Inc. (San Antonio, TX)
  58. Withers & Ravenel (Cary, NC)
  59. Langan Engineering & Environmental Services (Elmwood Park, NJ)
  60. CPH Engineers, Inc. (Sanford, FL)
  61. SCS Engineers (Long Beach, CA)
  62. Lowe Engineers, LLC (Atlanta, GA)
  63. CB Engineers (San Francisco, CA)
  64. BrightFields, Inc. (Wilmington, DE)
  65. Trihydro Corporation (Laramie, WY)
  66. Barr Engineering Co. (Edina, MN)
  67. Simpson Gumpertz & Heger Inc. (Waltham, MA)
  68. KCI Technologies, Inc. (Hunt Valley, MD)
  69. Cherokee Enterprises, Inc. (Miami Lakes, FL)
  70. JDavis Architects (Raleigh, NC)
  71. ka architecture (Cleveland, OH)
  72. SHW Group LLP (Plano, TX)
  73. EM-Assist, Inc. (Folsom, CA)
  74. Dorsky Hodgson Parrish Yue (Cleveland, OH)
  75. EAPC (Grand Forks, ND)
  76. Morris Architects (Houston, TX)
  77. Chen & Associates (Fort Lauderdale, FL)
  78. Group2 Architecture Engineering Ltd. (Red Deer, AB)
  79. Group One Partners, Inc. (Boston, MA)
  80. Cline Design Associates, PA (Raleigh, NC)
  81. BSA LifeStructures (Indianapolis, IN)
  82. Long Engineering, Inc. (Atlanta, GA)
  83. Clough Harbour & Associates LLP (Albany, NY)
  84. Groundwater & Environmental Services (Neptune, NJ)
  85. Matrix Design Group, Inc. (Denver, CO)
  86. NAC|Architecture (Spokane, WA)
  87. Collins Engineers, Inc. (Chicago, IL)
  88. Woolpert, Inc. (Dayton, OH)
  89. Pennoni Associates Inc. (Philadelphia, PA)
  90. Morrison-Maierle, Inc. (Helena, MT)
  91. Treanor Architects, P.A. (Lawrence, KS)
  92. BKF Engineers (Redwood City, CA)
  93. CTA Architects Engineers (Billings, MT)
  94. Paul C. Rizzo Associates, Inc. (Monroeville, PA)
  95. Maverick Engineering, Inc. (Victoria, TX)
  96. Interstates Engineering, Inc. (Sioux Center, IA)
  97. Aarcher, Inc. (Annapolis, MD)
  98. Henderson Engineers, Inc. (Lenexa, KS)
  99. V3 Companies Ltd. (Woodridge, IL)
  100. Hoefer Wysocki Architects, LLC (Kansas City, MO)
  101. CMX Inc. (Manalapan, NJ)
  102. Slater Hanifan Group (Las Vegas, NV)
  103. C.M. Architecture, P.A. (Minneapolis, MN)
  104. The HNTB Companies (Kansas City, MO)
  105. The Harman Group, Structural Engineers (King of Prussia, PA)
  106. Wolverton & Associates, Inc. (Duluth, GA)
  107. R.G. Vanderweil Engineers, LLP (Boston, MA)
  108. RNL (Denver, CO)
  109. Luchs Consulting Engineers, LLC (Hamden, CT)
  110. Fehr-Graham & Associates (Freeport, IL)
  111. M/E Engineering, P.C. (Rochester, NY)
  112. Applied Technology & Management, Inc. (Gainesville, FL)
  113. Vanasse Hangen Brustlin, Inc. (Watertown, MA)
  114. MC Consultants, Inc. (Carlsbad, CA)
  115. Vision Land Consultants, Inc. (Golden, CO)
  116. Wallace Engineering (Tulsa, OK)
  117. McDonough Bolyard Peck, Inc. (Fairfax, VA)
  118. Cuningham Group Architecture, P.A. (Minneapolis, MN)
  119. Ruby + Associates, Inc. (Farmington Hills, MI)
  120. Bohannan Huston, Inc. (Albuquerque, NM)
  121. Clark Nexsen Architecture & Engineering (Norfolk, VA)
  122. Baldridge & Associates Structural Engineering, Inc. (Honolulu, HI)
  123. TRC Companies, Inc. (Windsor, CT)
  124. Traffic Planning and Design, Inc. (Pottstown, PA)
  125. Johnson Engineering, Inc. (Fort Myers, FL)
  126. ESP Associates, P.A. (Fort Mill, SC)
  127. Calibre Engineering, Inc. (Littleton, CO)
  128. CirclePoint (San Francisco, CA)
  129. Environmental Partners Group, Inc. (Quincy, MA)
  130. Walker Parking Consultants (Elgin, IL)
  131. Fulghum, MacIndoe, & Associates, Inc. (Knoxville, TN)
  132. Marmon Mok, LLP (San Antonio, TX)
  133. Stewart Engineering, Inc. (Raleigh, NC)
  134. Kohrs Lonnemann Heil Engineers (Fort Thomas, KY)
  135. Dyer, Riddle, Mills & Precourt, Inc. (Orlando, FL)
  136. Gilsanz Murray Steficek, LLP (New York, NY)
  137. Aquaterra Environmental Solutions, Inc. (Overland Park, KS)
  138. Tsoi/Kobus & Associates, Inc. (Cambridge, MA)
  139. Geosyntec Consultants, Inc. (Atlanta, GA)
  140. STUDIOS Architecture (San Francisco, DC)
  141. EDSA, Inc. (Fort Lauderdale, FL)
  142. PGAL (Houston, TX)
  143. ACAI Associates, Inc. (Fort Lauderdale, FL)
  144. Cannon Design (Grand Island, NY)
  145. Phillips Partnership, P.C. (Atlanta, GA)
  146. GEI Consultants, Inc. (Woburn, MA)
  147. WilsonMiller, Inc. (Naples, FL)
  148. Johnson, Avedano, Lopez, Rodriguez & Walewski Engineering Group, Inc. (Miami, FL)
  149. CLC Associates, Inc. (Greenwood Village, CO)
  150. Corgan Associates, Inc. (Dallas, TX)
  151. Foresite Group, Inc. (Norcross, GA)
  152. O’Connell Robertson (Austin, TX)
  153. Dagher Engineering, PLLC (New York, NY)
  154. Integral Consulting Inc. (Mercer Island, WA)
  155. Arora Engineers, Inc. (Chadds Ford, PA)
  156. PACE (Fountain Valley, CA)
  157. Richard C. Lambert Consultants, LLC (Mandeville, LA)
  158. Building & Earth Sciences, Inc. (Birmingham, AL)
  159. CSArch Architecture | Construction Management (Albany, NY)
  160. Wantman Group, Inc. (West Palm Beach, FL)
  161. Penfield & Smith (Santa Barbara, CA)
  162. McGill Associates, P.A. (Asheville, NC)
  163. JCJ Architecture, Inc. (Hartford, CT)
  164. Hanson Professional Services Inc. (Springfield, IL)
  165. Miyamoto International, Inc. (West Sacramento, CA)
  166. GH2 ARCHITECTS, LLC (Tulsa, OK)
  167. BLRB Architects (Tacoma, WA)
  168. Atwell-Hicks (Ann Arbor, MI)
  169. Parametrix (Auburn, WA)
  170. Hall & Foreman, Inc. (Irvine, CA)
  171. Woodard & Curran, Inc. (Portland, ME)
  172. H.W. Lochner, Inc. (Chicago, IL)
  173. Creech Engineers, Inc. (Stuart, FL)
  174. Albert Grover & Associates (Fullerton, CA)
  175. Hood-Patterson & Dewar, Inc. (Norcross, GA)
  176. CSA Group (Miami, FL)
  177. LJA Engineering & Surveying, Inc. (Houston, TX)
  178. Dudek (Encinitas, CA)
  179. Rees Associates, Inc. (Oklahoma City, OK)
  180. Infrastructure Engineering, Inc. (Chicago, IL)
  181. Sparling (Seattle, WA)
  182. Bowman Consulting (Chantilly, VA)
  183. R.W. Beck, Inc. (Seattle, WA)
  184. Calvin, Giordano & Associates, Inc. (Fort Lauderdale, FL)
  185. Agoos/Lovera Architects (Philadelphia, PA)
  186. Harper Houf Peterson Righellis Inc. (Portland, OR)
  187. Wakefield Beasley & Associates (Norcross, GA)
  188. Bala Consulting Engineers, Inc. (King of Prussia, PA)
  189. P.W. Grosser Consulting, Inc. (Bohemia, NY)
  190. Clinard Engineering Associates, LLC (Brentwood, TN)
  191. Environmental Services, Inc. (Jacksonville, FL)
  192. Universal Engineering Sciences Inc. (Orlando, FL)
  193. GTM Architects, Inc. (Bethesda, MD)
  194. Jones & Carter, Inc. (Houston, TX)
  195. Cobb Engineering Company (Oklahoma City, OK)
  196. GGLO, LLC (Seattle, WA)
  197. Herschman Architects Inc. (Cleveland, OH)
  198. I&S Group (Mankato, MN)
  199. Jaster-Quintanilla (Austin, TX)
  200. LPA, Inc. (Irvine, CA)

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