News | October 17, 2025
Secretariat Experts Receive Recognition in Lexology Index Thought Leaders – USA 2026
Secretariat is proud to share that 11 of our experts have been named as USA Thought Leaders in Lexology Index’s 2026 listing.
Mr. Diffendall provides expert testimony on delay and quantum. His work includes advisory services, project controls, and schedule development. Mr. Diffendall’s industry experience includes oil & gas, infrastructure, energy, heavy industrial, aerospace, commercial & residential construction, and government contracts.
Washington, DC
Tim Diffendall has more than 20 years of experience providing project claims and dispute resolution, project advisory, scheduling services on government and private contracts for both owners and contractors. He has worked on “mega” and other large complex projects worldwide, including the United States, Canada, Mexico, Central and South America, the Middle East, Central Asia, and Africa.
His experience spans various industries, including mining, oil & gas, infrastructure, energy, heavy industrial, aerospace, commercial construction, and general residential. Mr. Diffendall has consulted on project management issues throughout the life of a project, from the proposal phase to advising clients during construction on cost control and schedule matters, to performing analyses from a forensic perspective. His forensic capabilities have focused on development, analysis, and resolution of schedule delay and cost overrun claims, with the results of his findings presented in mediation, arbitration (including international arbitration), and various other alternative dispute resolution forums.
Mr. Diffendall is certified as a Planning and Scheduling Professional and a Certified Cost Professional and is an expert in performing delay and cost overrun analyses on complex construction matters.
Secretariat Experts Receive Recognition in Lexology Index Thought Leaders – USA 2026
Secretariat is proud to share that 11 of our experts have been named as USA Thought Leaders in Lexology Index’s 2026 listing.
Tamika Tremaglio Named as One of the Most Powerful Women in Washington by Washingtonian Magazine
Secretariat Managing Director Tamika Tremaglio has been named as one of the Most Powerful Women in Washington by Washingtonian Magazine.
87 Secretariat Professionals Named in Lexology Index 2025 Consulting Expert Reports
Secretariat is pleased to share that 87 of our experts have been named in the Lexology Index 2025 Consulting Expert Reports series, achieving recognition as global industry leaders across several key categories.