ATON - Key Persons


Christopher Brewer

Job Titles:
  • Senior Environmental Engineer

Glenn G. Scherer

Job Titles:
  • Operations Manager
  • Vice President of Operations
  • Vice President of Operations With
Glenn serves as a Vice President of Operations with ATON LLC and supervises the environmental site assessments, site characterizations, soil and groundwater delineation, risk based corrective action, LNAPL recovery and remediation, and vapor intrusion assessments. As operations manager, Glenn is tasked with setting and meeting schedules for various project deadlines, mentoring of junior level staff, staff scheduling, providing technical/regulatory review of final reports, client and regulatory negotiations, development and implementation of ATON's standard operating procedures, development of report standards, and general oversight/supervision of staff. Glenn is a Registered Geologist/Professional Geologist in Missouri, Illinois, Tennessee, and Texas, and a licensed monitoring well and pump install in Missouri. With a Bachelor of Science in Geology from Southeast Missouri State University and a Master of Science degree from the University of Arkansas in Geology/Hydrogeology. He has 30 years of experience providing environmental consulting services.

Mark Underwood - SVP

Job Titles:
  • Senior Vice President
  • Senior Vice President With
Mark serves as a Senior Vice President with ATON LLC to achieve technical consistency relevant to evaluation of site conditions and establishment of site characterization and remediation activities in risk-based corrective actions and real estate decisions. During his 30 years of professional experience, Mark has provided professional services for large industrial projects, military sites, and complex environmental conditions in locations across the US and Canada. With a PhD in Hydrogeology, Mark has also provided professional guidance for drinking water problems that included large-scale field testing and numerical modeling to establish sustainable yields and plume migration. Mark has a PhD in Hydrogeology from the University of Hawaii, and MS and BS degrees from the University of Iowa. He is licensed in Missouri, California, Indiana, and Hawaii as well as the Canadian provinces of Alberta, Saskatchewan, and Ontario.

Riley Underwood

Job Titles:
  • Environmental Engineer
  • Environmental Engineer Read Full Bio
As an Environmental Engineer, Riley performs environmental engineering and industrial hygiene work including site characterization, due diligence, employee exposure monitoring, regulatory compliance, industrial health and safety, vapor intrusion assessments and permitting. Riley has provided technical services to commercial and industrial facilities, as well as local and state government agencies. Riley has worked on large scale dredging projects, site characterization, and environmental remediation projects in both the United States and Canada. Riley holds a Bachelor's in Civil and Environmental Engineering from the University of Missouri, Columbia and is a licensed Professional Engineer.

Ronald Carroll

Job Titles:
  • Managing Principal
Ron holds a B.S. in Environmental and Hazardous Materials Management and a B.A. in Biology from the University of Findlay. He is a Certified Hazardous Materials Manager, Certified Industrial Hygienist, and licensed asbestos and lead-based paint inspector in several states.

Tucker Clements

Job Titles:
  • Environmental Health and Safety Technician
  • Environmental Health and Safety Technician Read Full Bio
Tucker has provided technical services to residential, commercial, and industrial facilities, as well as local, state, and federal government agencies. Tucker is a licensed a Missouri licensed Asbestos Inspector and a Missouri and Illinois licensed Lead-Based Paint Inspector. Tucker holds a Bachelor of Science in Technology Management from Southeast Missouri State University. He is working towards a Master of Business Administration and Master of Science in Environmental Management at Webster University.

Tyler Freeman

Job Titles:
  • Environmental Scientist Read Full Bio
  • Environmental Scientist With
As an Environmental Scientist with ATON, Tyler is responsible for ongoing report writing and coordination associated with all phases of environmental assessment and remediation activities. Tyler is a licensed asbestos and lead inspector with over 6 years' experience in the environmental consulting field. His technical background includes experience with Phase I environmental site assessments, subsurface investigations related to soil, groundwater, and vapor remediation, risk assessments, underground storage tank closure, industrial hygiene monitoring, and regulated building material inspections. He has performed environmental oversight and air monitoring for several high-profile hazardous materials abatement projects. Tyler holds a B.S. in Earth and Environmental Sciences from Tulane University. He currently resides in Philadelphia.