Consultants & Laboratories

Raymond Petrisek, MS, ASCP(MT)SM, HEM, Senior Microbiologist

Raymond (Ray) Petrisek received his Bachelor of Science and Bachelor of Administration degrees in Microbiology from Kent State University and his Master of Science in Medical Microbiology from Ohio State University.  He is certified by the American Society of Clinical Pathology (ASCP), both as a medical technologist and specialist in microbiology and has over 35 years of experience in medical, health care environmental management and environmental microbiology.

Prior to joining HPE, Mr. Petrisek was Director of Immunopathology and Chief of Microbiology for a major reference medical laboratory.  Between 1987 and 1992, Mr. Petrisek founded Sunwood Development Corporation where he successfully designed and constructed innovative homes of distinction.  In 1993, Mr. Petrisek joined HPE in the position as Senior Microbiologist where he consults on indoor air quality (IAQ) assessments and reviews scientific data dealing with human exposure to biohazards and has conducted countless investigations of biocontamination of water damaged buildings and water systems.  Mr. Petrisek has successfully directed aerobiological assessments of numerous projects for law firms, military and governmental agencies, commercial and residential owners, hospital, medical and prison facilities, insurance companies and industrial facilities.  He has also provided expert testimony in administrative and arbitration hearings regarding indoor air quality, occupant exposure to bioaerosols, and microbiological issues within schools, hospitals, hotels, nursing homes, residences and office complexes.  Mr. Petrisek is a member of the American Academy of Allergy and Immunology, American Academy of Microbiology, American Industrial Hygiene Association (AIHA), American Society of Microbiology, and the International Association for Aerobiology.

Jonathon Hall, MPH, CIH, Director of Environmental Microbiology

Jonathon Hall is the Director of Environmental Microbiology and oversees the day-to-day operations of the microbiology laboratory, prepares and analyzes microbiological samples and acts as the Quality Assurance (QA) Office for the department of Microbiology.  Mr. Hall is a Board Certified Industrial Hygienist (CIH) with 10 years experience investigating and consulting on indoor air quality and industrial hygiene issues and provides leadership and technical support in the areas of occupational health, environmental and industrial hygiene, toxicology and epidemiology.  Mr. Hall conducts field investigations and surveys related to exposure assessments, standards compliance, and condition assessments related to field tasks that support HPE’s general services including, but not limited to, industrial hygiene surveys related to wet, water-damaged and/or mold-impacted building materials, noise, heat stress, crystaline silica, volatile organic compounds (VOCs), and indoor air quality.

Mr. Hall received his Bachelor of Science and Master of Science degrees in Marine Biology from the University of Guelph, Guelph, Ontario and the Memorial University of Newfoundland, St. John’s, Newfoundland, Canada, respectively.  Prior to joining HPE, Mr. Hall held the position of Research Assistant in the Department of Biochemistry & Environmental Medicine at The George Washington University Medical Center in Washington, DC where he researched oxidative-induced mechanisms of disease from magnesium deficiency, azidothymidine (AZT) and iron toxicity using whole animal and cellular models.  During his tenure at the medical center, Mr. Hall obtained a Master of Public Health (MPH) degree in Environmental & Occupational Health from the School of Public Health & Health Services from The George Washington University.     

John Pfaff, MS, Director of Environmental & Industrial Hygiene Chemistry

John Pfaff is an accomplished analytical chemist and laboratory manager with more than 25 years of experience.  Mr. Pfaff's expertise extends to the fields of environmental, industrial hygiene and pesticide residue chemistry.  Within these fields Mr. Pfaff has directed numerous research studies and site investigation projects involving the analysis of toxic substances in air, water, soil and biological samples.  In addition, Mr. Pfaff has directed and conducted numerous sampling activities for environmental surveys in land, rivers and reservoirs.  Mr. Pfaff has participated in the development of several laboratory information management database (LIMS) systems, with skills in managing laboratory and quality control data and in generating complex electronic data deliverables.

Mr. Pfaff received his BS and MS degrees from Virginia Polytechnic Institute and State University in Biological Sciences and Environmental Sciences and Engineering, respectively.  Mr. Pfaff was the Technical Director for a major Environmental Analytical Laboratory and has provided consulting expertise to several laboratories.  Earlier in his career Mr. Pfaff performed and provided oversight for numerous environmental monitoring projects and industrial hygiene bench studies, and managed an environmental chemistry section for commercial laboratories including a mobile lab.  At HP Environmental, Inc., Mr. Pfaff holds the position of Director of Environmental and Industrial Hygiene Chemistry and directs operations involving analysis of air sampling media, water and soil using a variety of techniques and instruments.

Company Biography: Laboratory Services