A licensed professional engineer, Mr. Horsak has more than 40 years experience in multiple phases of environmental engineering and science, from engineering and project management to strategic planning and construction. During his career, Mr. Horsak has provided risk assessments of air, water and waste contamination of petroleum hydrocarbons, pesticides, Agent Orange, carbon black, dioxins, PCBs, metals, radionuclides, biological pathogens, and other toxins. He has worked on more than 500 projects in the U.S. and 50 internationally, including abandoned/legacy sites, hazardous waste management facilities, refineries, chemical plants, fossil and nuclear power plants, geothermal energy plants, manufacturing and commercial facilities, pipelines, power transmission lines, oil and gas exploration and production sites, and public and private properties. The projects range in size from small consulting assignments to complex, multi-million-dollar developments with turnkey engineering and construction. Mr. Horsak has authored nearly 50 technical articles and presentations, and has served as an expert witness for plaintiffs and defendants.


  • Licensed Professional Engineer in Texas, Louisiana, Nebraska and Alabama
  • MS, Environmental Science, University of Texas at San Antonio, 1974
  • BS, Engineering, University of Texas, 1971


  • National Society of Professional Engineers, Member
  • Hazardous Substances Journal, Advisory Board
  • Air and Waste Management Association, Member
  • Texas Water Pollution Control Association, Member
  • Houston Engineers Society, Member
  • Houston Chamber of Commerce, Member
  • International Society of Environmental Forensics, Member
  • National Groundwater Association, Member
  • ASTM Committee on Forensic Environmental Investigations, Member
  • Forensic Expert Witness Association, Member
  • Association for the Advancement of Cost Engineering (International), Member
  • Texas Board of Professional Engineers, Technical Expert for Enforcement
  • Environmental Forensics Journal, Peer Reviewer
  • EPA Office of Research and Development, Peer Review Committee, Member

* Partial bio; contact Humatec for comprehensive CV