Our Top Management Team

Hygieneering, Inc. is a professional service provider and a certified woman-owned business. We provide environmental consulting, safety consulting, training and emergency response services. Our Team of certified industrial hygienists, certified safety professionals and environmental engineers have been developing proven, feasible and leagal solutions to environmental, health and safety issues since 1987.


Margaret Guidarelli CIH, ROH, MSEE

Owner, Co-Founder & President

Margaret founded Hygieneering in 1987 after working in the petroleum, oil and gas industry for eight years and obtaining her Masters of Science Degree in Environmental Engineering from IIT in Chicago.  She earned a Bachelor of Science degree from Illinois State University (ISU) in Environmental Health with a minor in Biology. She also earned the credentials of Certified Industrial Hygienist (CIH) from the American Board of Industrial Hygiene and Registered Occupational Hygienist (ROH) from the Canadian Registration Board of Occupational Hygiene.


Margaret remains active in the firm’s operations to ensure the highest caliber Environmental Health and Safety (EHS) services are delivered to Hygieneering’s clients in the manufacturing, healthcare, energy, academic, real estate and construction sectors.

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John Feller, CIH, CSP, CHMM

Chief Technical Officer

Mr. Feller joined Hygieneering 23 years ago and rose through the organization to become Senior Vice President of Business Consulting Operations. Following a business reorganization to promote further growth in the industry and to foster strategic management of client services, Mr. Feller was appointed President on May 1, 2015.


Mr. Feller has a Bachelor of Science from Northern Illinois University and a Master’s in Public Health from the University of Illinois at Chicago with an emphasis in Industrial Hygiene.  He is certified in the comprehensive practice of industrial hygiene (CIH) by the American Board of Industrial Hygiene and is also a Certified Safety Professional (CSP) and Certified Hazardous Materials Manager (CHMM).


Mr. Feller is accomplished in the recognition, evaluation and control of occupational health, safety and environmental hazards. Mr. Feller has particular expertise in Indoor Air Quality and general industrial hygiene and safety issues.  He currently manages a staff of 40 professionals at Hygieneering.

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Matt Guidarelli

Vice President, Strategies

Mr. Matt Guidarelli has been building business relationships for Hygieneering, Inc. since 1987. He earned a Bachelor of Science degree from Winona State University in 1989. His responsibilities include strategic business development, marketing, sales, client education and relationship building for our environmental, safety and emergency response services. Matt has also been instrumental in developing Environmental Construction Services that incorporate our Environmental Assessment and Indoor Air Quality Capabilities to deliver clean, green and LEED certified construction services.

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Kevin M. Konkey, CSP, CIT, CHMM

Executive VP, Environmental, Health & Safety (EHS) Technical Services

Mr. Konkey has been employed by Hygieneering since 1997 and has advanced to Vice President, EHS Technical Services. His focus is providing EHS technical consulting services to high-profile clients and business development.  He has earned a Bachelor of Science degree from Illinois State University (ISU) in Occupational Safety. He has also earned the designation as a Certified Safety Professional (CSP) and Certified Instructional Trainer (CIT) from the Board of Certified Safety Professionals (BCSP) and the designation as a Certified Hazardous Materials Manager (CHMM) from the Institute of Hazardous Materials Management (IHMM).

Mr. Konkey has expertise in the recognition, evaluation, and control of occupational health, safety and environmental hazards, as well as auditing, training and written program/procedure development. Mr. Konkey has specific expertise in emergency response and evaluating, developing, and implementing OSHA Process Safety Management (PSM) and EPA Risk Management Plans (RMP).

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Bob Anderson, CSP, CHMM

Chief Operating Officer

Mr. Anderson joined the Hygieneering team in 2014. He earned his Master’s Degree in Mechanical Engineering from the University of Illinois. He has more than 30 years of experience in environmental, health, safety and manufacturing operations and is also a Certified Safety Professional (CSP) and a Certified Hazardous Materials Manager (CHMM).


Mr. Anderson has lead EH&S, operations and facility activities in manufacturing and service industries. He has extensive experience with EPA related compliance issues for facility management and remediation activities.

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Mike Bartos, PM/ASP, BI, MP, PD (WI)

Managing Director, Environmental Construction Services

Mr. Bartos has been employed by Hygieneering since 1998 and has over 27 years of environmental safety and health related consulting experience. He earned a Bachelor of Science degree in 1987 from Northern Illinois University (NIU) in the area of Biological Sciences and is a State of Illinois Licensed Asbestos Building Inspector, Project Manager, Air Sampling Professional and Management Planner since 1991. Mr. Bartos is also a State of Wisconsin Licensed Project Designer, Supervisor and Building Inspector.


Mr. Bartos’ expertise includes performance and management of toxic substance surveys for asbestos, lead and mold in addition to providing design and management of all levels of environmental remediation projects in the public and private sector. He also specializes in estimating and managing large scale demolition and renovation projects for health care facilities, school buildings and power/industrial plants.

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Travis Fellers, CIH, CSP

Director, Technical Services

Travis began his career with Hygieneering in May of 2014 after receiving his BS in Environmental Health and Safety from Illinois State University. The past 2 years, Travis has focused on his professional development, passing his ASP Exam in June 2019, the CSP Exam in February 2020, and most recently, the CIH Exam in May 2021. Currently, he is enrolled in graduate school at Montana Tech, earning his Masters in Industrial Hygiene and expected to be completed in August 2022.

David L. Zeidner, MS, CMR, WRT, LEED AP

Director, Indoor Air Quality & Emergency Response Services

Mr. Zeidner has been employed by Hygieneering since 2006. He has a Master of Science degree and over 12 years of R&D lab experience as well as over 12 years of environmental consulting experience including CAT response work following the 2004 & 2005 gulf state hurricanes. 


Mr. Zeidner provides clients with technically superior and timely consulting and testing services.  He oversees and conducts Indoor Air Quality Management & Mold Prevention Programs in office buildings, hospital, university dormitories, schools and government buildings. He performs IAQ investigations including sick building & odor issues, designs and manages mold remediation projects and manages emergency flood responses. Mr. Zeidner has provided technical instruction training services on environmental health and safety topics such as IAQ, mold, odor and flood response issues to national groups.


Mr. Zeidner’s expertise in environmental portfolio management includes mold & moisture assessments, odor investigations, indoor air quality assessments and water abatement.

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