Making the Difference for our clients for over 18 years.

Recognized by Who's Who Legal and GAR 100 as a top International Expert Consultancy, Delta's multi-disciplined professionals in engineering, accounting, construction, and program management provide Delay Analysis, Damages Analysis, Project Advisory and Financial Advisory Services on complex projects throughout the world.

Delta's Featured Projects

  • All
  • Bridges And Roads
  • Buildings
  • Commercial Damages
  • Damage Analysis
  • Defects
  • Delay Analysis
  • Education
  • Energy And Power
  • Environmental
  • Expert Witness
  • Government
  • Heavy Civil
  • International
  • Latin America
  • Loss Of Productivity
  • Oil And Gas
  • Project Advisory
  • Scheduling And Planning
  • Transportation
  • Title
  • Date
load more hold SHIFT key to load all load all

Delta has provided Consulting Services on
Projects in 40 Countries

Delta Map showing 40 countries

Working with clients in their own country and often in their own language, or from our offices in the U.S., our professionals have successfully completed assignments throughout the globe.

Meet Our Team

Dr. Tong Zhao

tzhao-bio Page 1 Image 0004Tong Zhao, PhD, PE, PSP, is an industry-recognized expert in loss of productivity who has performed numerous productivity analyses. He has served on various ASCE and AACE International committees on loss of productivity developing relevant industry standards. Dr. Zhao has authored more than 10 publications on loss of productivity in peer-reviewed journals and conference proceedings.

Other Delta Professionals