Delta is an international consulting firm of multi-disciplined professionals in engineering, accounting, construction, program management and litigation support.  Delta “makes the difference” for our clients.

Our experts provide delay, damage and defects analysis, forensic accounting, loss of productivity, and expert witness services, among others, on multifaceted litigation and arbitration cases around the world.  Delta’s project management and construction professionals provide a full array of services including project controls, construction audits, planning and scheduling, budget analysis, as well as cost and risk management services.  

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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, recently co-authored an article, "Improved Baseline Method to Calculate Lost Construction Productivity", a peer-reviewed article, that was published in the February issue of the Journal of Construction Engineering and Management. He has performed numerous productivity studies including craft labor inefficiencies, as well as engineering design and fabrication inefficiencies.

Other Delta Professionals