Staff

Dania Rodriguez
Executive Director
Board of Directors and Administration
(202) 640-1061

Charles Reyes
Associate Director
Federal Facilities Subcommittee
CEC Steering Committee
(202) 640-1063

Kerry Callahan
Senior Program Manager
Hazardous Waste Subcommittee
Materials Management Subcommittee
(202) 640-1062

Gina Miranda
Program Manager
Tanks Subcommittee
(202) 640-1067

Sam Puffenbarger
Program Manager
CERCLA and Brownfields Subcommittee
(202) 640-1064

T.J. Gannon
Web & Technology Specialist
(202) 640-1065

Maria Warner
Accounts Administrator
(202) 640-1066

Since 2013, Dania Rodriguez has been the Executive Director of the Association of State and Territorial Solid Waste Management Officials (ASTSWMO) in Washington, DC. She has over two decades of demonstrated national environmental experience with expertise in the field of technical, financial and policy development and a comprehensive knowledge of State and Territorial (States) environmental programs.
Prior to her career at ASTSWMO, Dania worked for the American Petroleum Institute (API). Dania received a B.A. in Political Science from Hood College in Frederick, Maryland, and an Executive Certificate in Nonprofit Management from the Georgetown University, McCourt School of Public Policy. Dania enjoys spending time with her family and dogs, traveling, good food and wine, and being an advocate for the environment and the ASTSWMO membership.
Charles Reyes is the Associate Director at the Association of State and Territorial Solid Waste Management Officials (ASTSWMO). He has over 15 years of experience supporting state and federal government agencies, departments, and their staff responsible for implementing environmental protection regulations and policies in the United States. As Associate Director, Charles manages the Association’s cooperative agreements and contracts with federal and private industry partners and assists the Executive Director with developing policies and procedures for ASTSWMO. He also oversees activities of the ASTSWMO Federal Facilities Subcommittee and Contaminants of Emerging Concern Steering Committee.
Prior to his career at ASTSWMO, Charles worked for HydroGeoLogic, Inc., supporting state governments and Department of Defense clients. He holds a B.A. in Political Science – Legal Studies from Virginia Tech in Blacksburg, VA, and a Masters Certificate in Supervisory and Human Resources Management from Michigan State University’s Eli Broad College of Business.
Kerry Callahan is a Senior Program Manager with the Association of State and Territorial Solid Waste Management Officials (ASTSWMO) in Washington, D.C. She staffs the Hazardous Waste and Materials Management Subcommittees and their Task Forces. She has a B.A. in Political Science from American University and a Master’s in Public Policy from Georgetown University. Kerry enjoys living in Washington, D.C.
Sam Puffenbarger rejoined ASTSWMO in November 2022 as the CERCLA and Brownfields Program Manager. Sam has over 10 years of combined environmental experience. Before working at ASTSWMO he spent time at FEMA doing GIS disaster mapping and before that worked on the National Flood Insurance Program at a private engineering firm. Sam has a B.S. from West Virginia University in Psychology and an M.P.A in Environmental Science and Policy from George Mason University. Before his return to ASTSWMO, Sam spent 8 years in the craft beer industry eventually ending up as a head brewer in the DC area. When Sam is not at work he and his wife enjoy hanging with their dogs, going to shows, talking beer and biking around the city.
Coming from ‘Little Rhody’ Rhode Island before moving to Arlington, Virginia, Gina has collaborated with multiple community members, small businesses, and non-profit organizations in hopes of aiding the State's ever-changing economy towards growth, access, and opportunity for future generations. In 2018, Gina participated in an internship with the CDC at the University of Michigan: Ann Arbor where she understood more about how public health and environmental health behaviors and policy have informed the health statuses of disadvantaged communities around the U.S. Today, with a degree in Public Health, Gina plans to bring her passions, skills, and experiences to ASTSWMO and the Tanks Subcommittee as the Program Manager.
TJ joined the ASTSWMO Team in May 2017. Hailing from Florida where he received a B.A. in Digital Media from the University of Central Florida, TJ handles everything from web design and development to audio and visual needs at ASTSWMO conferences.
In his free time TJ enjoys the DC bar scene with his fellow UCF alumni and trivia friends, and quiet nights at home watching movies and playing videogames with his fiance Sarah.
Maria Warner has been the Accounts Administrator for ASTSWMO for the past 4 years in the Washington, DC office. She has over 17 years of demonstrated experience as a bookkeeper and office administrator. Prior to joining ASTSWMO Maria was the bookkeeper for a financial management firm and an air quality control company.
Maria received her B.S. in Finance with a minor in Management Information Systems/ Decision Support Systems from the University of Delaware. Upon graduation, Maria worked for Booz Allen & Hamilton as a database design and software developer. She took time off to raise her 3 beautiful children, then rejoined the work force as a bookkeeper. In her spare time, she loves spending time with her family, especially at the east coast beaches. She’s also a recreational (slow and not many miles) runner who dabbles in a few 5ks to stay goal oriented.