Timothy R. Henderson co-founded and manages Rich and Henderson, P.C. which represents local and national clients in a variety of matters including environmental permitting, merger and acquisition due diligence, natural resources issues, and land use matters. His practice focuses on regulatory compliance counseling on hazardous and solid waste (involving both RCRA and Superfund), environmental permitting, air quality, wastewater disposal, water use, and transactional and enforcement matters. Guiding investors through the maze of federal, state and local environmental requirements for the acquisition of businesses or land is also a major focus of his law practice.

After graduating from the Wisconsin Law School in 1980 he worked for five years at the Environmental Law Institute in Washington, DC; from 1985 to 1987  he was an Assistant Regional Counsel at EPA Region II in New York City.  His work with law firms began in 1987,  for six years in NYC, two years in Washington, DC and, since 1993, in Maryland.

Henderson was a member of the Corridor Cities Transitway Area Advisory Committee Two, a planning advisory committee operated by the Maryland Transit Administration for the purpose of engaging public participation for proposed transit projects in Montgomery County, Maryland. He is a past President of the Maryland State Bar Association’s Environmental Law Section.

Henderson received both his master’s and law degrees from the University of Wisconsin-Madison. He is admitted to practice in Maryland, Washington, DC, New York and Wisconsin; before the Federal District Courts of Maryland, the Eastern and Southern Districts of New York, the U.S. Court of Appeals for the Fourth Circuit and the U.S. Court of Appeals for the District of Columbia Circuit.

Education History

  • B.A. Environmental Science, State University of New York at Purchase
  • M.S. Land Resources Management, University of Wisconsin
  • J.D. Law, University of Wisconsin

Work Experience

Instructor, JHU Whiting School of Engineering, Engineering for Professionals


Recent Presentations –
1/9/14 – “Water Pollution, Storm Water and Wetlands: Tougher Rules on New Facilities and Retrofitting the Existing ” to CO LEI National Conf. in Vail, CO.

1/15/14 – “MD CT of Appeals, Exxon Jacksonville Gasoline Spill Decisions – Lessons Learned: (or how to avoid or secure $1.65 billion in verdicts)” with Alan Garten, Esq. to Lambda Alpha International Balt. Chap.

1/7/15 – “Stormwater, TMDLS & Little Bit of Wetlands: Changing Rules & Recent Cases” to CO LEI National Conf. in Vail, CO.

1/6/16 – “Climate Change – It’s Happening Whether We Like it or Not, So How’s the Practice of Law Changing with It” to CO LEI National Conf. in Vail, CO.

1/6/17 – “Climate Change – The 2015 Paris Accord, The Clean Power Plan and Adaptation/ Resiliency Tools Being Built into Land Use Laws and Changes Predicted by the Trump Administration” to CO CLE National Conf. in Snowmass, CO.

1/3/18 – “Nuances of Citizen Suits for Releases of Hazardous and Solid Waste” to National CO & LEI, CLE Conf. in Vail, CO.

1/2/19 Citizen Suit Enforcement of the Clean Water Act and RCRA – Recent Developments to CO CLE National Conf. in Snowmass, CO.

3/7/20 Wetlands and Storm Water Regulations Applicable to the Construction Industry – Half Moon Conference, Virtual

Professional Organizations

Maryland State Bar Association, Environmental Law Section
Wisconsin Bar Association
New York State Bar Association
Environmental Law Institute
Environmental Law Network