TSI Leadership

Glenn R. Lowenstein, P.G., CAPM, President

An environmental professional since 1990, Mr. Lowenstein is both a licensed Professional Geoscientist with the State of Texas and a licensed Corrective Action Project Manager with the Texas Commission on Environmental Quality. Mr. Lowenstein has a Master of Science in Geology from Texas A&M University at College Station. He has performed hundreds of Environmental Site Assessments for both governmental and private interests.

During the course of these assessments, he has supervised the installation of monitor wells, performed and overseen the collection of soil and groundwater samples, and has conducted numerous slug and pump tests. His experience also includes remediation projects, UST removals, and aquifer analysis.

Glenn served as Chairman of the Houston Geological Society's Environmental & Engineering Geology Committee for seven years and is a recipient of the Houston Geological Society's prestigious President's Award. The Governor of Texas appointed Mr. Lowenstein to the Texas Board of Professional Geoscientists in 2005.

Allison Johanson, Project Geologist

Ms. Johanson graduated from Baylor in 1986 with a B.S. and from Texas A&M with a MS in Geology in 2005. Ms. Johanson is OSHA 40-hour and Supervisor trained and is up-to-date in her first aid and CPR training.

She has since worked in the environmental field in the Gulf Coast area performing environmental investigations of properties such as retail petroleum sites, former terminal facilities, retail commercial facilities, former plating and foundry sites, and retail manufacturing facilities. Her project experience includes environmental investigation, remediation, regulatory compliance and waste disposal. Allison's expertise includes performance of Phase I and II ESA's, well sampling and core evaluation, preparation of surface and subsurface maps and diagrams, supervision of drilling, monitoring well installation and core identification.

Matthew Cowan, Project Geologist

Mr. Cowan graduated with a BS in Geology in 1993 and a MS in Geology in 2000 from Texas A&M University – Kingsville. Mr. Cowan is a licensed Professional Geoscientist in Texas (#12653), has a Corrective Action Project Manager license (#44), and is. OSHA 40-hour traine.

His responsibilities include project support in a wide range of consulting disciplines including: Phase I/II and Real Estate Due diligence assessments, hydrogeologic contaminant investigations, remediation, underground storage tank removals, and environmental investigations, conduction of field activities to determine and delineate the vertical and horizontal extent of surface and subsurface hydrocarbon contamination through utilization of direct push technology, logging of boreholes, installation of monitoring wells, and soil/groundwater sampling.

Debra Balthazar, Project Geologist

Mrs. Balthazar graduated from Rice University, Houston, Texas with a Bachelors of Geology with Sub-disciplines in Geophysics/Environmental Science/Engineering. She has taken graduate classes at the University of Houston in Civil Engineering- Environmental, environmental law classes at Bates School of Law, and air quality and dispersion modeling at the University of Michigan/EPA.

Mrs. Balthazar duties include permitting and regulatory coordination for clients including municipalities, private industry, manufacturing and oil & gas industries.  Internally, she is responsible in the development of policies, procedures, programs/training, and best management practices to ensure compliance with applicable safety, health and environmental rules/regulations.  Mrs. Balthazar performs and supervises the preparation of: environmental site assessments, groundwater sampling and analysis, ecological assessments/reports, installation/development of monitoring wells, contamination delineation, OSHA compliance, underground storage tank compliance audits, construction safety plans, SWPP Plans, geologic cross-sections, and site remediation plans.

Amy Saliger, CADD Technician

Miss Saliger graduated from the Art Institute of Houston in 1996 with an emphasis in design. She is a CADD technician having previous experience as a land surveyor and drafter. Ms. Saliger has extensive experience in producing stratigraphic sections, complex geologic/hydrologic maps, and aerial photographs used for TCEQ reports and litigation.

Alysa Suydam, Staff Geologist

Alysa graduated from Texas A&M University in August 2015 with a Bachelor of Science in Geology with a Minor in Geoinformatics. With her extensive database management experience from the Texas Water Development Board and GIS library at A&M, she is in charge of report production of field data on assessments such as contaminant stability and groundwater flow modeling. She assists in field work, historical research, and preparation of Phase I and II ESAs. Ms. Suydam is working on her GIT certification.