Jump to content

Patrick MacLeamy

From Wikipedia, the free encyclopedia
MacLeamy at HOK 60th anniversary (2015)
Moscone Center in San Francisco
Moscone Center in San Francisco
King Khalid International Airport in Riyadh, Saudi Arabia
King Khalid International Airport in Riyadh, Saudi Arabia

Patrick MacLeamy, FAIA,[1] LEED AP (born October 2, 1942, in Alton, Illinois), is an American architect and executive who is chairman of buildingSMART International.[2] Previously, he served as Chairman and CEO of HOK, a global architecture, engineering and planning firm.[3] MacLeamy is the author of the book Designing a World-Class Architecture Firm: The People, Stories and Strategies Behind HOK, published by Wiley in April 2020.[4] The book tells the history of HOK, one of the largest design firms in the world,[5] and draws lessons from HOK intended to help other architects and creative services professionals improve their own practices. “Build Smart,” a podcast co-hosted by MacLeamy and Mark R. LePage, AIA, NCARB, is inspired by MacLeamy's book.[6]

MacLeamy has served as an industry advocate for the need to leverage new technologies and collaboration tools to improve the practice of architecture. As a founder and chairman of buildingSMART International (formerly the International Alliance for Interoperability), MacLeamy has advanced the global implementation of building information modeling (BIM) to improve the quality and efficiency of the architectural design process.[7][8] He also supports the establishment of nonproprietary and interoperable standards for the exchange of data in the design and construction industry.[9][10]

MacLeamy developed a concept, commonly referenced in the design and construction industry[11][12] as the MacLeamy Curve,[13] to illustrate the escalating cost of design modifications as a project team progresses in the design process. His time-effort distribution curves "are among the most oft-cited sources for researchers interested in mainstreaming building information modeling (BIM) implementation in the architecture, engineering and construction (AEC) industry."[14][15]


MacLeamy began practicing at HOK in the firm’s St. Louis office in 1967. He relocated to San Francisco in 1970 to help establish the firm’s first regional office. He was named managing principal of that office in 1983 and became HOK's chief operating officer in 2000.[16] In 2003, MacLeamy was appointed CEO[17] and in 2012 he also was named chairman. In April 2016, as part of a planned succession, he stepped down as CEO but remained as HOK’s chairman until June 2017.[18][19]

During his career, MacLeamy has served leadership roles on several prominent architectural projects, including the Moscone Center in San Francisco[20] and the King Khalid International Airport in Riyadh, Saudi Arabia.[21]

In 2019, MacLeamy was elected a fellow in the National Academy of Construction.[22] He is the past chairman and a current member of the Construction Industry Round Table, a national business trade association.[23] He served on the American Institute of Architects (AIA) Large Firm Roundtable, composed of CEOs from large architectural and engineering firms working to advance the interests of practices working nationally and internationally.[24] In 2005, MacLeamy was honored with the President’s Award from the National Institute for Building Sciences (NIBS).[25]

MacLeamy was the keynote speaker at the Nordic BIM Academy’s buildingSMART conference in Copenhagen, Denmark, in November 2016. Nordic BIM Academy is Scandinavia’s largest conference devoted to OpenBIM. MacLeamy described his vision of BIM and collaboration in the AEC (architecture/engineering/construction) industry.[26]

He is a Fellow of the American Institute of Architects, a Leadership in Energy and Environmental Design credentialed professional and appears as a guest on architectural, sustainability and business/leadership podcasts and forums. [27][28][29][30][31][32][33][34]


MacLeamy claims to have developed the concepts of the "MacLeamy Curve" in 2004 as explicitly stated in his YouTube videos[35] However the basis of these ideas and curves first appeared in an article written by Professor Boyd Paulson in 1976.[36] some 28 years prior to Patrick MacLeamy's development of the "MacLeamy Curve".


MacLeamy and his wife, architect Jeanne MacLeamy, FAIA, live in Novato, California.[37] American television journalist, author and speaker Elisabeth Leamy is their daughter. Their son, Patrick D. MacLeamy, is a licensed psychologist.

See also[edit]


  1. ^ "2019 AIA Fellows Directory". Issuu. Retrieved 2021-08-19.
  2. ^ "Board of Directors". buildingSMART International. Retrieved 2020-05-05.
  3. ^ "HOK Chairman Patrick MacLeamy Retires After 50 Years With Firm". buildingSMART International. 2017-06-08. Retrieved 2020-05-05.
  4. ^ "Designing a World-Class Architecture Firm: The People, Stories, and Strategies Behind HOK | Wiley". Wiley.com. Retrieved 2021-08-19.
  5. ^ "ENR 2018 Top 500 Design Firms". www.enr.com. Retrieved 2020-05-05.
  6. ^ "Architizer Asks: Patrick MacLeamy On Building Smart". Journal. 2021-04-26. Retrieved 2021-08-19.
  7. ^ "Smart Market Report: The Business Value of BIM in North America" (PDF). McGraw-Hill. Retrieved 26 October 2016.
  8. ^ Mordue, Stefan; Swaddle, Paul; Philip, David (December 2015). Building Information Modeling for Dummies. Wiley. pp. 95, 259. ISBN 978-1-119-06005-5.
  9. ^ "The Only Game in Town: Chairman Sets Out His Vision" (PDF). buildingSMART International. Retrieved 26 October 2016.
  10. ^ Pearson, Andy. "Special Report: Bringing in BIM". Building.co.uk. Retrieved 27 October 2016.
  11. ^ "Executive guide to BIM: Part 2". AEC Magazine. Retrieved 26 October 2016.
  12. ^ Miller, Rex; Strombom, Dean; Black, Bill; Iammarino, Mark (2009). The Commercial Real Estate Revolution. Wiley. pp. 127–128. ISBN 978-0470-45746-7. Retrieved 26 October 2016.
  13. ^ "The MacLeamy Curve - Real World BIM and IPD". IDEAbuilder. 24 June 2012. Retrieved 26 October 2016.
  14. ^ Lu, Weisheng; Fung, Ada; Peng, Yi; Liang, Cong; Rowlinson, Steve (2015). "Demystifying Construction Project Time–Effort Distribution Curves: BIM and Non-BIM Comparison". Journal of Management in Engineering. 31 (6). American Society of Civil Engineers. doi:10.1061/(ASCE)ME.1943-5479.0000356. hdl:10722/231258. Retrieved 26 October 2016.
  15. ^ "Interoperability in the Construction Industry" (PDF). American Institute of Architects. McGraw-Hill Construction. Retrieved 26 October 2016.
  16. ^ "Executive Profile: Patrick MacLeamy, FAIA, LEED AP". Bloomberg Business. Retrieved 26 October 2016.
  17. ^ "People/Firms". Building Design + Construction. 11 August 2010. Retrieved 27 October 2016.
  18. ^ Brennan, Vince. "HOK Names New CEO in Succession Plan". St. Louis Business Journal. Retrieved 27 October 2016.
  19. ^ "HOK Chairman Patrick MacLeamy Retires After 50 Years With Firm". Informed Infrastructure. 2017-06-08. Retrieved 2021-08-19.
  20. ^ "Development and Financing". Moscone Center website. Retrieved 26 October 2016.
  21. ^ "King Khaled International Airport, Riyadh, Saudi Arabia". airport-technology.com. Retrieved 26 October 2016.
  22. ^ "Mark Perniconi, Carlos Hernandez Elected to National Academy of Construction". Lyles School of Civil Engineering - Purdue University. Retrieved 2020-05-05.
  23. ^ "HOK's Patrick MacLeamy Elected Chairman of the Construction Industry Round Table" (PDF). Construction Industry Round Table website. Retrieved 26 October 2016.
  24. ^ "People on the Move". Engineering News-Record. Retrieved 27 October 2016.
  25. ^ "Awards and Honors | National Institute of Building Sciences". www.nibs.org. Retrieved 2021-08-19.
  26. ^ "NBIMA 01 Patrick MacLeamy". YouTube. Retrieved 15 November 2016.
  27. ^ "E2025 – Patrick MacLeamy". 29 September 2020.
  28. ^ "Facing Crisis (And Thriving) with Patrick MacLeamy".
  29. ^ "BuildingSMART with Patrick MacLeamy".
  30. ^ "Climate Change with Scott Amyx on Apple Podcasts". Apple Podcasts. Retrieved 2021-08-19.
  31. ^ "Episode – C-Suite Radio". Retrieved 2021-08-19.
  32. ^ "Creating Structure: Creating Structure Podcast #17, Patrick MacLeamy, Author, Chairman, buildingSMART Int'l / Former CEO, HOK, FAIA on Apple Podcasts". Apple Podcasts. Retrieved 2021-08-19.
  33. ^ "#203 - PATRICK MACLEAMY, designing a world-class-architecture firm". THE SECOND STUDIO. Retrieved 2021-08-19.
  34. ^ "US Modernist Radio - Architecture You Love: #144/HOK: Patrick MacLeamy + Bill Hellmuth, plus A Few Minutes with Frank Harmon". usmodernist.libsyn.com. Retrieved 2021-08-19.
  35. ^ MacLeamy, Patrick. "The future of the building industry - the effort curve". YouTube. HOK Network.
  36. ^ Paulson, Boyd C (December 1976). "Designing to reduce Construction Costs" (PDF). Journal of the Construction Division. 102 (C04): 587. doi:10.1061/JCCEAZ.0000639.
  37. ^ "Editorial: MacLeamy, Lucan, Butler in Novato". Marin Independent Journal. 25 September 2015. Retrieved 26 October 2016.