• David Berkowitz
    David BerkowitzManager of Fenceline Programs and Business Development of Enthalpy Analytical, Inc.

    David Berkowitz is Manager of Fenceline Programs and Business Development of Enthalpy Analytical, Inc.  Mr. Berkowitz has been with Enthalpy for over 20 years and has extensive experience with air regulations and associated EPA test methods.  Included in this experience is his leadership on all Enthalpy’s Benzene fenceline monitoring projects and programs.

    Mr. Berkowitz has also assisted EPA method writers with comment during the drafting of EPA Method 325A and 325B and was instrumental in support of their method validation efforts.  He has participated in numerous fenceline monitoring workshops as a presenter and contributed on papers as an expert in laboratory measurement, sample collection, and handling.

  • Kevin Crosby
    Kevin CrosbyVice President Technical of Montrose Air Quality Services

    Kevin Crosby is Vice President Technical of Montrose Air Quality Services. Mr. Crosby has been testing stack emissions since 1976.  He has tested nearly every type of source, and has special expertise in research-level quality testing programs, testing toxic or HAPs emissions (metals, dioxins/furans, PAH, PCB, etc.) and offers best practices for standard test methods (e.g. EPA 5, 201A, 202) to measure particulate emissions at low concentrations from gas-fired turbines, engines and boilers. He also has expertise in techniques for testing low concentrations of gaseous emissions (VOC, NOX, SO3, SO2, Ammonia, etc.) as well as innovative dilution techniques to measure ultra-low particulate emissions from gas-fired units, condensable PM avoiding “artifact” sulfate and other interferences and engine emissions as described in 40 CFR 1065 and ISO 8178. Mr. Crosby has provided test results for engineering purposes such as tuning of SCR ammonia injection. He holds a B.S. in Meteorology from San Jose State University.

  • S. Thorne Gregory III
    S. Thorne Gregory IIITechnical Director of Enthalpy Analytical, Inc.

    S. Thorne Gregory III is Technical Director of Enthalpy Analytical, Inc. in Durham, NC. Mr. Gregory has been with Enthalpy Analytical, Inc. since 2008 and has conducted environmental testing using a variety of analytical methods. Focusing primarily on direct gas analysis, Mr. Gregory has performed numerous tests using Gas Chromatography (GC) and Fourier Transform Infrared Spectroscopy (FTIR) and has been a technical resource and advisor for on-site analytical testing across the country.   His primary compliance experience has been with EPA methods 15/16, 18, and 320/321.  Mr. Gregory has also provided testing for plant support purposes to help tune control devices and for general process optimization.  Performing on-site analyses in temporary and unfamiliar conditions creates special safety concerns.  Mr. Gregory maintains an STS certification as part of his ongoing commitment to safety, particularly in challenging field environments. He holds a Bachelor’s of Science Degree in Chemistry from UNC Chapel Hill and a Master’s of Science Degree in Toxicology from NC State.

  • Angela Hansen
    Angela HansenPrincipal Scientist of Montrose Air Quality Services

    Angela Hansen is Principal Scientist of Montrose Air Quality Services. Ms. Hansen has been working in the stack testing field since 1980, and over her career, has performed emission testing field work, directed emission test programs, reviewed and reported the results for emission test programs, interfaced with hundreds of clients and regulatory agents, and managed the business of emission testing. Her specialties include CEMS certifications, low-level emissions reporting, and she is considered to be an expert in the use of the EPA’s Electronic Reporting Tool (ERT).

    She has assisted in the instruction of many training sessions and workshops presented by SES, AWMA, PNWIS, APTI, and ISA as well as internal company training. She has been very active in the leadership and activities of AWMA since 1988 and is a Fellow Member. She is also an active member of the Source Evaluation Society (SES) and is the current Secretary for SES. She was the Conference Chair for the 39th Stationary Source Sampling and Analysis for Air Pollutants Conference (SSSAAP) in Tucson, Arizona and was the General Conference Chair for the 2008 AWMA Annual Conference and Exhibition (ACE) in Portland, Oregon. She was inducted into the SES Hall of Fame in 2016. She holds a B.S. in Marine Resources from Huxley Environmental College of Western Washington University with minors in both chemistry and biology.

  • Tanya Jackson
    Tanya JacksonProject Manager of Montrose Air Quality Services

    Tanya Jackson is Project Manager of Montrose Air Quality Services, LDAR Division. Ms. Jackson has been a Project Manager for 5 years, specializing in agency liaison, regulatory compliance analysis and data management.  Her expertise includes Tagging and Inventory, Greenhouse Gas Emissions, LDAR Method 21 Monitoring, Optical Gas Imaging and Tank Seal Inspections. Prior to joining the Montrose team she was employed as an Air Quality Inspector with the South Coast Air Quality Management District in Southern California, where she served on the enforcement team, providing her with a unique perspective on quality assurance in the LDAR industry. Ms. Jackson is a frequent presenter at national LDAR conferences. She holds a B.S. in Environmental Science from the University of California at Riverside.

  • Alexandra Martin
    Alexandra MartinSenior Chemist/Group Leader of Enthalpy Analytical, Inc.

    Alexandra Martin is Senior Chemist/Group Leader of Enthalpy Analytical, Inc., based in Richmond, Virginia. Ms. Martin previously worked for Arista Laboratories, before its acquisition by Enthalpy Analytical in May of 2015, and was responsible for the development, validation and continuous improvement of analytical methods for the determination of a wide range of compounds in tobacco smoke and smokeless tobacco products. Prior to joining Arista in 2000, Ms. Martin was a Senior Chemist at Labstat International where she began working with tobacco and tobacco smoke in 1989. During her time at both laboratories, she has developed methods for Health Canada, ANVISA (Brazil) and proposed FDA regulatory reporting of HPHCs in mainstream smoke (MS) and smokeless tobacco products (STP). She is an active member of the CORESTA Special Analytes and Routine Analytical Subgroups and the American Chemical Society (ACS). She has a Bachelor of Science Degree in Biology and Chemistry and a Master’s Degree in Analytical Chemistry, specializing in GC/MS from the University of Waterloo, Ontario, Canada.

  • Bernie Sheff
    Bernie SheffVice President of ES Engineering Services

    Bernie Sheff is Vice President of Engineering for ES Engineering, Inc.  He is also Chairman of the Board of the American Biogas Council.  Bernie has been a Registered Professional Engineer in Michigan since 1988, and is also registered in Massachusetts, Ohio and Indiana. He started his career with STS Consultants (STS) in 1984 as an assistant project engineer. He became the Vice President of the Michigan region for STS and completed his first digestion project (as part of a 1 MGD wastewater treatment facility) in 1991. The wastewater treatment facility was a large beef abattoir in SW Michigan and was the first of many projects in the animal processing industry, including duck, chicken and hog operations. Since early 2000, Bernie has focused on nutrient recovery, sand separation and digestion in the agricultural market, primarily the dairy industry, and the co-digestion of residuals from confined feeding operations and food processing residuals.  He holds both Bachelors and Masters of Science degrees in Civil Engineering from Michigan State University.