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.
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).
Tim Ratsep is the Administrator of the Delaware Department of Natural Resources and Environmental Control (DE-DNREC) Site Investigation and Restoration Section. He is responsible for the Superfund, Brownfields, Voluntary Cleanup, Federal Facilitates, and the Pre-Remedial programs within the State of Delaware. As part of these responsibilities, Tim oversees the State Hazardous Substance Cleanup Act fund, which receives millions of dollars in State funding allocated to remedial programs. Although, historically State allocations have been substantial to address its liabilities; due to funding reallocations Tim has been working with limited funds to balance priorities such as emergency response and unanticipated groundwater contamination relating to PFAS.
Prior to joining the State in 2005, 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 Governors 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 this past year became Chair.
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.
Conchita San Nicolas Taitano has been the ASTSWMO voting member for Guam for over 20 years and an active member for the last decade. She served in ASTSWMO as a Task Force member on one of the past Hazardous Waste Task Forces, the ASTSWMO Region 9 Board Representative for four years, and currently is the Region 9 member on the ASTSWMO Sustainable Materials Management Task Force.
Conchita has been with the Guam Environmental Protection Agency (Guam EPA) for 29 years and working as the Air and Land Division Administrator for over 22 years overseeing the Air Program, Pesticides Program, Hazardous Waste Program (which includes RCRA C, RCRA I and SPCC), and the Solid Waste Program.
Conchita received her Bachelor of Science in Biology and Masters of Science degrees from the University of San Francisco. In addition, she studied Environment and Sustainable Development from the United Nations University in Tokyo, Japan. She also studied Environmental Policy Making from the UNESCO Water Institute in the Delft, Netherlands.
Prior to her career in the environment, Conchita was a high school math and science teacher. She is a past president for Soroptimist International of the Marianas and currently a member of the State Rehabilitation Council as a disability advocacy representative. In addition, she is the founding president for the newly formed, provisional SWANA Pacific Basin Chapter, and a Lector for her church. Conchita is also the proud mom of two children: Mariana and Frederick.
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.
Millie Garcia-Serrano (MA) – Contact
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.
Mike Ryan (NY) – Contact
Michael Ryan, P.E. is the Division Director for the New York State Department of Environmental Conservation’s Division of Environmental Remediation (DER). He has been with the NYSDEC for over 31 years, starting as a project engineer, then program manager, and Assistant Division Director beginning in 2012. He was promoted to the position of Director in February of 2018. He oversees a Statewide staff and is responsible for administration of the multiple State programs managed by DER including the State Superfund Program, Brownfield Cleanup Program, Environmental Restoration Program, Spill Response Program, and Hazardous Waste Management (RCRA) Corrective Action Program.
He holds a B.S. from the State University of New York in Physics, and a B.S. in Civil and Environmental Engineering from Clarkson University.
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.
Steve Sliver (MI) – Contact
Steve has served in the Michigan Department of Environmental Quality’s waste programs for over 31 years. He is currently the Assistant Director of the Waste Management and Radiological Protection Division, responsible for promoting recycling and waste utilization, pollution prevention, ensuring the proper management of materials under the hazardous waste and liquid industrial by-products, solid waste, scrap tire, medical waste, and e-waste programs, and protecting the public and environment from the hazards associated with radioactive materials. Steve recently agreed to assist in Michigan’s effort to identify and remediate sources of per- and polyfluoroalkyl substances (PFAS) contamination throughout the state. He serves as the department’s representative on PFAS related activities. Steve obtained his bachelor’s degree in engineering from Michigan Technological University in 1985.
Bill Shafford (TX) – Contact
Bill Shafford is a registered Professional Engineer in the state of Texas. He received his Bachelor of Science in Chemical Engineering from the University of Texas (UT) in May of 1987. After working in consulting for a couple of years, Bill started employment with the Texas Water Commission (later to be the Texas Commission on Environmental Quality) in December of 1990. His work at the agency has included primarily hazardous waste permitting and remediation. Since 2011, Bill has been a Technical Specialist in the Office of Waste. In that capacity, he addresses technical issues across the Office, including those that impact multiple Divisions within the Office.
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).
Luke Esch (WY) – Contact
Luke Esch is the Administrator of the Solid and Hazardous Waste Division of the Wyoming Department of Environmental Quality (DEQ). Alongside a talented staff, Luke works to regulate the storage, treatment, and disposal of municipal solid waste, industrial waste, and hazardous waste throughout Wyoming. Luke also oversees environmental remediation projects and manages the Underground Storage Tank Program in order to address environmental impacts and return contaminated properties to productive use.
Luke has been in his current position for 7 years, and before joining DEQ, he was a Senior Assistant Attorney General in the Water and Natural Resources Division of the Wyoming Attorney General’s Office. Before joining the State of Wyoming, Luke worked in private practice in Denver, Colorado at a regional law firm focusing on Superfund redevelopment projects. Luke received his Bachelors of Science degree in Agricultural Business from Colorado State University and his Juris Doctorate degree from the University of Wyoming. Luke currently serves on the Board of the Regional Institute of Health and Environmental Leadership and is a 2017 graduate of Leadership Wyoming.
Luke resides in Cheyenne with his wife and two children. His interests include reading, running, skiing, backpacking, hunting, fly-fishing, and western history.
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)
- 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)