The Executive Committee
The Executive Committee of the Association is comprised of the President, Vice-President, immediate Past-President, and Secretary-Treasurer. A Vice-President is elected annually from a slate of candidates by a majority vote of the State Voting Representatives. The Vice-President serves a one-year term before advancing to the role of President. At the conclusion of the President’s one-year term he/she advances to the position of immediate Past President for a one-year term. The Secretary-Treasurer position is elected to a two-year term by a majority vote of the Association’s State representatives.
Tim Ratsep is the Director of the Delaware Department of Natural Resources and Environmental Control (DE-DNREC) Division of Waste and Hazardous Substance. He is responsible for Brownfields, Emergency Response, Federal Facilities, Hazardous Waste, Pre-Remedial, RCRA C, RCRA I, Recycling, Solid Waste, Superfund, and the Voluntary Cleanup programs within the State of Delaware. Tim became the Director in 2019 where he led a substantial reorganization of the Division to better serve customers by aligning limited resources to address cross-programmatic challenges. Tim joined the State in 2005 were he was the the Administrator of the the State cleanup programs and had oversight of the State Hazardous Substance Cleanup Act fund, which receives millions of dollars in State funding allocated to remedial programs. Prior to joining the State, Tim worked in the private sector on RCRA and CERCLA facilities throughout the United States. During his tenure with the State, Tim has initiated Lean management principals within the Section. He has been recognized in two Governor Team Excellence projects that utilized limited resources to meet the Department objectives. These projects resulted in tens of millions in savings for the State. Tim became active in ASTWMO in 2009 and joined the Remedial Action Focus group in 2013 working to become Vice-Chair and then Chair. Tim was honored to be elected in 2018 as Treasurer/Secretary and in 2020 was elected as vice president.
Tim received a Bachelor of Science in Environmental Soil Science from the University of Delaware and has a Master’s of Business Administration from Wilmington University. He is married to his grade school sweetheart and has two wonderful children.
Ms. Millie Garcia-Serrano was appointed Regional Director of the Massachusetts Department of Environmental Protection’s Southeast Regional Office in 2015, after serving as Deputy Regional Director for the Bureau of Waste Site Cleanup from 1998 to 2015. As Regional Director, Millie is responsible for the optimal management of the region’s operations, including pre-permitting, regulatory compliance assistance, enforcement program management, and municipal partnering and outreach. Millie also provides active support to a number of key MassDEP programs including drinking water, wastewater management, wetlands & waterways, air quality, asbestos, C&E, solid waste, brownfields, emergency response, state (c.21E) and federal site cleanup/auditing. Millie has 31 years of demonstrated public and private sector experience with focused expertise in environmental assessment and cleanup, risk characterization, brownfields redevelopment, environmental justice and natural resources damages.
Millie is a member of the Association for Environmental Health & Sciences Foundation’s (AEHS) Scientific Advisory Board tasked with providing advisory support to the Annual International Conference on Soils, Sediments, Water and Energy, and is a voting member of the AEHS Foundation’s Charlena Seymour Diversity Scholarship Committee. A native of San Juan, Puerto Rico, Millie has a Bachelor of Science in Biology from the University of South Alabama, College of Art & Sciences in Mobile, Alabama and a Master of Public Health from Boston University’s School of Medicine in Boston, Massachusetts.
Brent is the Director of the Utah Division of Environmental Response and Remediation (DERR), one of five divisions of the Utah Department of Environmental Quality (UDEQ). He began his state career in 1990 working in the Superfund Program as a state project manager for the Monticello Millsite and Vicinity properties NPL sites and CERCLA actions at the Kennecott mining complex. In December 2009, Brent was appointed Director of the DERR, which in addition to CERCLA includes the Utah Underground Storage Tank program (UST compliance, PST Trust Fund management, and LUST cleanups). In this capacity, Brent serves as one of two Executive Secretaries to the Utah Waste Management and Radiation Control Board. He also serves as the UDEQ delegated representative to the State Emergency Response Commission (SERC).Brent holds both a B.S. and M.S. degree in Geology from Brigham Young University and a Masters of Business Administration degree from the University of Utah. He is a Utah-registered Professional Geologist. He and his family reside in Lehi, Utah, where he serves on the Lehi Planning Commission. He is married to Melissa Darrington and together they have three children: daughters Kendall (age 15) and Bronwyn (age 13), and son, Christian (age 9).
April started her environmental career as an engineer with the Kentucky Department for Environmental Protection in 1997, in the Division for Air Quality. Serving as a permit writer and later as the Supervisor of the Metallurgy Section, she oversaw permitting of various metal producing facilities. In 2003, April joined the Kentucky Division of Waste Management as the Hazardous Waste Permit Review Section Supervisor and in 2005, she was promoted to the Hazardous Waste Branch Manager. April’s primary responsibilities include overseeing the permitting and clean up of RCRA facilities, including the Blue Grass Army Depot destruction of nerve agents and the cleanup at the Paducah Gaseous Diffusion Plant. April is a graduate of the University of Kentucky with a B.S. in Chemical Engineering.
Members of the Board other than officers are elected by a State regional caucus and consist of one representative from each of the 10 EPA Regions. Each Board member serves an initial 3-year term and may serve a maximum of two full consecutive 3-year terms with the consent of their regional caucus. Board members are vested with the authority to carry out the affairs of the association and to exercise leadership in raising and exploring policy issues of potential concern to the membership.
Gabrielle Frigon (CT) – Contact
Gabrielle Frigon has worked for Connecticut’s Department of Environmental Protection (Department of Energy and Environmental Protection since 2011) for over 30 years in various programs. In October of 2020 she re-joined the Waste Engineering and Enforcement Division as the Assistant Division Director within the Bureau of Materials Management and Compliance Assurance (MMCA). In this role, Gabrielle is involved in oversight for and the development of DEEP strategies and processes in support of the goals and objectives resulting from the Connecticut Coalition for Sustainable Materials Management and oversees Solid and Hazardous waste permitting and enforcement programs, Pesticides Management program and the Sustainable Materials Management program. Prior to her current role Gabrielle led the MMCA Office of Policy and Planning in 2019 and 2020 where she drafted legislation to advance waste reduction and increase diversion of organics and beneficial use of soils. In 2007 Gabrielle joined the Waste Engineering and Enforcement Division as the supervisor for Solid and Hazardous Waste Permitting for the state and, for a short time concurrently supervised the Source Reduction and Recycling program and their efforts to advance the goals of the state-wide Solid Waste Management Plan. Gabrielle’s career with the state of Connecticut started in 1990 when she was hired into the state’s Superfund Pre-Remedial program where she conducted Preliminary Assessments, Site Inspections and Site Inspection Prioritizations of Connecticut’s listed Hazardous Waste Sites as well as being the state’s liaison with US EPA on the Hazard Ranking System. Additionally, Gabrielle has represented DEEP in administrative hearing processes on enforcement cases and defending contested permits. Gabrielle obtained her Bachelor of Science degree from St. John’s University, her Master’s degree from Duke University, and Doctoral courses in Physics at New York University.
Wilmarie Rivera Otero (PR) – Contact
Wilmarie Rivera Otero is the Chief of the Underground Storage Tanks Division in the Water Quality Area in the Puerto Rico Department of Natural and Environmental Resources (DNRE) since November 2014. She earned a Bachelor of Science in Agriculture with concentration in Agronomy from the University of Puerto Rico, Mayagüez Campus, a Master of Science in Environmental Management with concentration in Environmental Risk Assessment and Management and completed curriculum courses leading towards a PhD at the Doctoral Program in Environmental Sciences at the Turabo University in Puerto Rico. Mrs. Rivera began working at the Puerto Rico Department of Agriculture for 5 years before working at Puerto Rico Environmental Quality Board (at present DNER) in 2003. From 2003 to 2008 worked as a Remedial Project Manager for the Superfund Division, and from 2008 through 2014 worked as the Federal Facilities Coordinator of PREQB in charge of all DoD investigations and cleanups conducted in Puerto Rico, including the islands of Vieques and Culebra.
Casey Korbini (WV) – Contact
Casey Korbini is the Deputy Director for Remediation Programs within the Division of Land Restoration at the West Virginia Department of Environmental Protection. She has been serving the citizens of West Virginia through her work at the agency for over eight years. In her current role, which she assumed in November 2017, she leads the Office of Environmental Remediation and its associated programs (Brownfields Assistance, Federal Facilities Restoration, Superfund, UECA-LUST, and Voluntary Remediation Programs). Casey holds a B.S. in Economics from the Wharton School at the University of Pennsylvania, where she concentrated in management and minored in environmental studies.
Tim Bahr (FL) – Contact
Tim is the Director of the Division of Waste Management, Florida Department of Environmental Protection (FDEP). Tim has been with FDEP since 1987 after working for EPA Region V in the underground injection control program. He started his career with FDEP as an environmental specialist in the Petroleum Cleanup program. With over 32 years with FDEP, Tim has worked in almost all facets of the Division of Waste Management’s programs. In 1997, Tim presented to the legislature options for Florida to consider when enacting risk based corrective action laws. In 2003, Tim was promoted to environmental administrator of the Hazardous Waste (RCRA) program. For eleven years, he supervised, managed and provided guidance for the statewide RCRA permitting, compliance and cleanup program. In 2014, Tim was promoted to Program Administrator for the Permitting and Compliance Assistance Program. In this role, Tim administered all aspects of permitting, compliance and enforcement processes for solid and hazardous waste and storage tanks system programs. In 2016, Tim began serving in the Director’s office as the Assistant Director for the Division of Waste Management. In 2018, Tim began serving as Director. The Division of Waste Management provides oversight of solid and hazardous waste and petroleum storage system prevention programs and all remediation (cleanup) programs. Tim is a Professional Geologist, and resides with his wife Tammi in Tallahassee, Florida.
Jim Sferra (OH) – Contact
James (Jim) Sferra, Assistant Chief, Division of Environmental Response and Revitalization, has over 30 years of experience with time in both private environmental consulting and State of Ohio Environmental Protection Agency. As a consultant Jim’s work focused on human health and ecological risk assessment, assisted with chemical-specific dose response studies (both human health and ecological receptors), wetland delineations/re-construction, and biological surveys. At Ohio EPA, Jim has held numerous positions from front-line hazardous waste inspector/risk assessor to various Environmental Administrator level positions in both a District Office (overseeing all agency programs in a 23 county District Office) and in a Division Office (RCRA, Superfund programs, Federal Facilities, and brownfields). He was an active member or various national work groups such as the National Governor’s Association Federal Facilities Task Force and the Environmental Council of the States Federal Facilities Forum. Jim has both a Bachelor’s Degree and a Master’s Degree from Bowling Green State University, Ohio.
Yolunda Righteous (LA) – Contact
Yolunda has over 30 years of environmental experience in the field of waste permitting compliance, training, and project management. She is a Baton Rouge native with a Bachelor of Science Degree in Biology from Dillard University in New Orleans and began her career at the Louisiana Department of Environmental Quality (LDEQ) in 2001. I rejoined the LDEQ after working for nearly 15 years as the Waste Services Regulatory Director for Providence Engineering and Environmental Group LLC. In 2018, she earned a Law Degree from Southern University Law Center.
Currently, she serves as the Administrator of the Waste Permits Division of the LDEQ. Yolunda also serves as a Board Member of the Louisiana Solid Waste Association (LSWA) where she is the Conference Chair for the LSWA/LDEQ Louisiana Environmental Conference and Trade Fair.
Along with her current role as the Region 6 ASTSWMO Board Representative, Yolunda also serves as the Region 4 Director and a member of the Board of Directors for the Solid Waste Association of North America (SWANA).
Bob Jurgens (KS) – Contact
Bob is the Director of the Bureau of Environmental Remediation, one of six bureaus of the Kansas Department of Health and Environment (KDHE), Division of Environment. Bob has over twenty-five years in the environmental consulting and regulatory field. He has held several management positions at KDHE since 1998 and currently oversees four sections providing oversight for the Bankruptcy, Brownfields, Dry Cleaner Remediation, Environmental Liability Release, Environmental Use Control, Federal Facility, Natural Resource Damages, Orphan Site, Risk Management, Site Assessment, Spill Response, State Cooperative, Storage Tank, Superfund, Surface Mining and Voluntary Cleanup Programs. Bob has Bachelor of Science (BS) degree from the University of Nebraska – Lincoln, specializing in groundwater hydrology. He serves as a Division lead for information technology and data management systems. Bob also is as a Deputy Commander for KDHE emergency operations. He and his wife, Teresa reside in Topeka, Kansas, where he is active in his church, as well as enjoying the outdoors while hiking, golfing and mountain biking. Bob and Teresa have two adult children: daughter Ashley (accountant in Kansas City) and son, Cameron (mechanical engineer in Tulsa, OK).
Suzanne Engels (WY) – Contact
Suzanne Engels is the Administrator of the Solid and Hazardous Waste Division of the Wyoming Department of Environmental Quality (DEQ). Alongside a talented staff, Suzanne regulates the storage, treatment, and disposal of municipal solid waste, industrial waste, and hazardous waste throughout Wyoming. Suzanne also oversees environmental remediation projects and manages the Underground Storage Tank Program, which addresses environmental impacts and returns contaminated properties to productive use.
Suzanne has served DEQ for the past 13 years in various roles within the Solid and Hazardous Waste Division and the Water Quality Division. Before joining the State of Wyoming, Suzanne worked for the Colorado Department of Public Health and Environment in the Water Quality Control Division and for the City of Englewood at the Littleton/Englewood Wastewater Treatment Plant. She also had short tours with the US Fish and Wildlife Service and the US EPA Region 8. Suzanne is active in ASTSWMO and was the Vice-Chair for the Solid Waste Disposal and Conversion Task Force within the Materials Management Subcommittee.
Suzanne earned her Bachelor of Science degree in Environmental Science and Computer Science from Regis University and her Master’s degree in Environmental Science and Engineering from the Colorado School of Mines. Suzanne resides in Cheyenne with her husband, three children, one dog, and six chickens. She enjoys all types of outdoor activities with her family including camping, canoeing, hiking, and fishing.
Laura Malone (AZ) – Contact
Laura Malone has directed ADEQ’s Waste Programs Division since October 2012. The division oversees cleanup at state and federal Superfund sites, permits and inspects hazardous and solid waste activities and facilities, and promotes waste reduction through pollution prevention and recycling. It also facilitates expedited remediation and property reuse through the state’s Voluntary Remediation and Brownfields programs.
Malone began her career at ADEQ in 1988, working in inspections and compliance and as a hydrologist in both the Waste Programs Division and Water Quality Division for 16 years. She held several management positions, including supervising the Hazardous Waste Inspections and Compliance Unit.
In 2004, Malone left ADEQ and joined LFR Environmental Consultants (now Arcadis) in Scottsdale as Senior Project Scientist. In this role, she worked on soil and groundwater remediation sites and helped establish a multimedia compliance auditing practice.
In 2006, Malone became Environmental, Health and Safety Manager with Goodrich (now UTC Aerospace Systems). There, she was responsible for ensuring regulatory compliance with air, water and waste programs and managing the occupational safety and health program for the plant. Malone has a bachelor’s degree in Environmental Science from Grand Canyon University.
Christina Carpenter – Contact
Christina Carpenter is the Director of the Division of Environmental Health for the Alaska Department of Environmental Conservation. She provides strategic direction and leadership across multiple programs that comprise the Division, including food safety and sanitation, drinking water, solid waste, pesticides, the Office of the State Veterinarian, and Alaska’s Environmental Health Laboratory. The close relationship of these diverse programs demonstrates implementation of the “One Health” model in Alaska, a worldwide strategy which recognizes that human, animal and environmental health are intricately related and seeks to expand interdisciplinary collaborations and communications across these disciplines. Prior to her current position, Carpenter served as Operations Manager for the Division, and was responsible for guiding resource allocation across the Division’s programs to meet state-wide environmental health and protection goals. She holds both a master’s and bachelor’s degree in Business Administration.
Below is a List of ASTSWMO Past Presidents:
(years represent year of Presidency)
- 2021: Brent Everett (UT)
- 2020: Conchita Taitano (GU)
- 2019: Chip Crockett (AL)
- 2018: Ken Kloo (NJ)
- 2017: Mark de Bie (CA)
- 2016: Bonnie Buthker (OH)
- 2015: Mike Forbeck (PA)
- 2014: Ryan Benefield (AR)
- 2013: Jeffery Steers (VA)
- 2012: Ed Thamke (MT)
- 2011: Stephen A. Cobb (AL)
- 2010: Gary W. Baughman (CO)
- 2009: Peggy Harris (CA)
- 2008: Michael A. Savage (OH)
- 2007: Gerald W. Hardy (AL)
- 2006: Terrence Gray (RI)
- 2005: Stephen Hammond (NY)
- 2004: Jay Ringenberg (NE)
- 2003: Jennifer Kaduck (GA)
- 2002: Mark Giesfeldt (WI)
- 2001: David Finley (WY)
- 2000: Michael Kelly (NC)
- 1999: James Warner (MN)
- 1998: Howard Roitman (CO)
- 1997: Nicholas DiPasquale (DE)
- 1996: Mary Jean Yon (FL)
- 1995: Teresa Hay (IA)
- 1994: Daniel Eden (TX)
- 1993: Paul Didier (WI)
- 1992: Daniel Cooper (AL)
- 1991: Cheryl Koshuta (ID) & Daniel Cooper (AL)
- 1990: David Shelton (CO)
- 1989: William C. Child (IL)
- 1988: Bryan Dixon (TX)
- 1987: John Taylor (GA)
- 1986: Robert Malpass (SC) & William Cass (MA)
- 1985: Earl Tower (WA)
- 1984: Donald Lazarchik (PA)
- 1983: Richard Valentinetti (VT)
- 1982: Norman H. Nosenchuck (NY)
- 1981: Jack Carmichael (TX)
- 1974 – 1980: Moses McCall (GA)