Wayne Ma, PE President and CEO

Wayne Ma has fifteen years of experience in providing geotechnical and construction materials testing services and is very knowledgeable in local and state requirements and construction procedures. Mr. Ma has successfully completed over 300 projects in educational, residential, commercial, and industrial development.

Wamiq Hamid, PE Vice President

Wamiq Hamid, PE serves as Vice President and Director of Construction Services at DMY.  His primary responsibilities include overall management and development of the construction related services and the laboratory operations.  Prior to joining DMY, he was responsible for overall management and development of the construction services department of an ENR Top 50 Design Firm’s branch office.  He has extended and applied corporate policies, procedures, and strategies and helped organizations develop standards for the technical and engineering works. He is responsible for organizing and providing staff training and recruiting new personnel.  He also serves as the Director of Laboratory Testing services and is responsible for the overall quality assurance of the organization.  He has extensive experience in field and laboratory testing for soil, aggregate, concrete, asphalt, and other construction materials.​

Paul Zhang, PE Vice President

Paul Zhang, PE serves as Vice President and Director of Geotechnical Engineering at DMY. Mr. Zhang has more than 15 years of experience in geotechnical engineering, construction materials testing and inspection and construction management.  He has extensive experience in the public sector, especially in transportation, and has successfully completed a wide array of projects with the Department of Transportation (DOT) and the Federal Aviation Administration (FAA).   Prior to joining DMY, Mr. Zhang was the Branch Manager of a well-established engineering consulting company.

Bob Holstead, PE Practice Leader, Construction Services

Robert Holstead, PE serves as Branch Manager and Principal Engineer at DMY. Bob has more than 22 years of experience in geotechnical engineering, construction materials testing and inspection and construction management.  He has extensive experience in the public sector and has successfully completed a variety of projects for both public and private sector clients.   Prior to joining DMY, Mr. Holstead was the Branch Manager, Practice Leader, and Vice President of a well-established Mid-Atlantic Region engineering consulting company.

Dr. Xin Chen, PE Practice Leader, Geotechnical

Dr. Xin serves as the Practice Leader for the Geotechnical Division. He has more than 16 years of geotechnical engineering, pavement design, pavement management, project management, & program management experience. Dr. Chen has extensive experience in geotechnical and geological subsurface exploration for site characterization using auger boring, split-spoon sampling, Standard Penetration Test (SPT), Cone Penetration Test (CPT), Dilatometer Test (DMT), etc. Dr. Chen also has extensive experience in geotechnical laboratory testing including soil compaction, permeability measurement, consolidation test, direct shear test, unconfined compression test, and triaxial test. Dr. Chen has extensive experience in providing geotechnical and pavement engineering recommendations on highway transportation projects such as embankment, cut slopes, steepened soil slopes, shallow foundations, immediate foundation, deep foundations, slope stability analysis, soil slope stabilization solutions such as Reinforced Soil Slope and imbricated stone wall, soil improvement solutions such as geosynthetic reinforcement, dynamic soil compaction, stone column, wick drains, compaction grouting, and micropiles; retaining wall structures such as concrete cantilever wall, gravity wall and Mechanical Stabilized Earth wall. Dr. Xin Chen has experience in pavement management, pavement engineering/design, pavement field data collection, pavement condition evaluation, and pavement forensic study. Prior to joining DMY, he was with Maryland State Highway Administration from 2006 to 2016 and he was Assistant Division Chief for the Maryland State Highway Administration, responsible for two technical programs: Geotechnics and Specification Review.

Daniel Pao Practice Leader, Drilling

Mr. Daniel Pao has over thirteen years of drilling experience in various residential and commercial projects in the Washington DC, Maryland, Virginia, and Pennsylvania area. He is very familiar with the local geology and drilling requirements and is very knowledgeable in roadway soil borings and post-hole clean-up and repair as well as proper drill rig access and set-up in live traffic. Mr. Pao has operated various drill rigs, including CME 45C, CME 55LC, CME 550, CME 75, CME 55, Acker Scout, Diedrich D50, Simco Skid Rig, Little Beaver Mechanical Drill, as well as Tripod. He has successfully performed drilling related tasks such as: Hollow Stem auger drilling, NW/L rock coring, Mud Rotary drilling, Monitoring Well Installation, Seismic Geophone Installation, Inclinometer Installation, Temporary Piezometer, Collaboration with Pressure Meter testing, Percolation Test Pipe Installation, Infiltration Testing, DCP testing, and Well Abandonment. Mr. Pao also has experience managing drill crews who speak foreign languages. He is fluent in English, Spanish, and Mandarin Chinese.

David Arwood Marketing Director

David Arwood serves as Marketing Director at DMY. David began his marketing career over 20 years ago and has been a marketing professional in the A/E/C industry since 2000. David has worked for an architecture firm, a civil engineering firm, an MEP firm, and now leads the marketing efforts to help DMY become the leading geotechnical firm in the Washington metropolitan area.