Our People
Personnel Summaries
Leonard C. Slosky, R.E.A., P.E.S.

Leonard Slosky is an environmental scientist with over 30 years of experience. He is an active member of the ASTM committee that developed the 2005 ASTM Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process. Mr. Slosky is a Professional Environmental Scientist (Colorado) and a Registered Environmental Assessor (California).

Prior to founding Slosky & Company in 1985, Leonard Slosky was Assistant to the Governor of Colorado for Science, Technology, and Environmental Policy. He was a staff director in the Office of Science and Technology Policy, Executive Office of the President (White House) and served on an interagency committee of the National Security Council. He has testified before committees of the U.S. Congress eight times concerning environmental and waste management issues. Mr. Slosky provided leadership and expertise in low-level radioactive waste management on a committee of the National Academy of Sciences. In recognition of his policy contributions, the U.S. Secretary of Energy appointed Mr. Slosky to the Waste Isolation Pilot Plant Blue Ribbon Panel. He was the co-chair of the Denver Metro Chamber of Commerce’s Environment Committee.

Currently, Mr. Slosky offers his expertise in the transformation and redevelopment of contaminated properties to risk-adverse financial institutions, real estate developers, and law firms.


Richard P. Lesser, M.S., C.H.M.M.

Richard Lesser, M.S., MBA, is a Certified Hazardous Materials Manager and senior project manager with 25 years of environmental experience. He is very experienced with the regulatory and technical foundations of the environmental industry, successfully completing projects governed by many environmental statutes including RCRA, TSCA, CERCLA, CWA, CAA, NEPA, BRAC, and AEA. He has been effective in leading highly technical negotiations with environmental regulatory authorities, on topics ranging from detonation permits for destruction of highly hazardous explosive wastes to disposal requirements for newly regulated, low-hazard wastes. Mr. Lesser has extensive multidisciplinary experience with modern principles in environmental and analytical chemistry, regulatory applications, and quality assurance resulting in cost savings and efficient environmental assessments, with several of his project successes documented in his twenty-two publications and public presentations. He has hands-on, design, and interpretive experience in sampling; evaluation of environmental matrices and high concentration waste materials; and use of analytical measurements to assess regulatory implications. He has been successful with mentoring subsidiaries, affiliates, and managers in the art of environmental management.

For ten years, Mr. Lesser has worked to resolve conflicting local development and managed growth issues. Two of his most recent efforts involved the facilitation of a development proposal that had engendered local opposition, and reconciling conflicting industrial/residential land use authorizations within his local community.


Andre Gonzalez, C.I.H.

Andre Gonzalez has over 25 years of experience in industrial hygiene, safety, and environmental remediation. He is certified in the comprehensive practice of industrial hygiene. His areas of expertise include asbestos and lead identification and management; beryllium compliance; indoor air quality; air contaminant sampling and interpretation of analytical results; construction and demolition safety, hazardous waste cleanup; employee training (confined space entry, hazard communication, etc.); health and safety plan preparation and implementation. 


Erin Trail, P.E.

Erin Trail is an environmental engineer with over 18 years of experience. She is a registered Professional Engineer in Colorado, Texas, and Louisiana.

Ms. Trail’s experience includes site characterization and assessment, site management, remediation/corrective-action planning, and project oversight. She has managed large- and small-scale projects, focusing on delivery of cost-effective site assessment and remediation strategies. Her client portfolio has ranged from commercial clients consisting of refineries, chemical plants, railroads, and aerospace to public sector clients, including USEPA, state-led programs, and the Air and Army National Guards. She has extensive experience in negotiating closure strategies with regulators. Currently, as a Senior Project Manager with Slosky and Company, Ms. Trail specializes in due diligence and remediation planning for urban redevelopment of environmentally impaired commercial real estate.

In addition to her professional work and accomplishments, Ms. Trail is a three-time Ironman competition finisher (Texas, 2011; Coeur d’Alene, Idaho, 2013; and Boulder, Colorado 2014).