John D. Conner, Jr.

 Senior Counsel Washington, D.C.
Phone: +1 202.624.2512
1001 Pennsylvania Avenue NW
Washington, DC 20004-2595

John D. Conner, Jr. is a senior counsel in the Environment & Natural Resources Group in Crowell & Moring’s Washington, D.C. office. His practice focuses on pesticide and chemical regulatory issues.

For over 40 years, he has provided regulatory counseling to pesticide companies on a wide variety of registration, registration review, and enforcement issues relating to agricultural and non-agricultural pesticides. Since 1980, he has counseled joint ventures conducting product safety testing under the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA) and the Toxic Substances Control Act (TSCA) on their formation, antitrust, tax issues, and pesticide regulatory compliance issues. Mr. Conner serves as general counsel for the Industry Task Force II on 2,4-D Research Data and the MCPA Task Force Three. 

Mr. Conner has also represented pesticide registrants before the Environmental Protection Agency in numerous significant regulatory proceedings, including hearings involving chlordane/heptachlor, dinoseb, and diazinon. He conducts internal FIFRA and TSCA compliance audits and assists clients in the development of compliance systems. He has also been involved in pre-acquisition environmental audits of chemical manufacturing plants. 

He formerly served as chairman of the Board of Technology Sciences Group, a pesticide and chemical consultancy. Mr. Conner is listed in the 2013, 2018, and 2019 editions of Best Lawyers in America in the area of Environmental Law. He is also listed as a top environmental attorney in the 2017 and 2018 editions of Super Lawyers.


Admitted to practice: District of Columbia

Professional Activities and Memberships

  • Member, American Bar Association
  • Member, The Federal Bar Association

Speeches & Presentations

  • "Pesticide Imports and Exports: Facilitating Global Commerce," CLA and RISE 2018 Regulatory Conference, Arlington, VA (April 26, 2018). Presenter: John D. Conner, Jr.
  • "Task Force Formation & Data Comp Issues," Pesticide Data Compensation and Protection in a Global Marketplace, Cary, NC (April 5, 2018). Presenter: John D. Conner, Jr.
  • "At the Forefront of Data Compensation," Pesticide Data Compensation and Protection in a Global Marketplace, Cary, NC (April 5, 2018). Presenter: John D. Conner, Jr.


  • "Pesticide Regulation Handbook," 4th Edition, McKenna Long & Aldridge LLP (2007). Co-Editor and Co-Author: John D. Conner, Jr.
  • "China's Regulation of Agricultural Biotechnology," Metropolitan Corporate Counsel (December 2006). Co-Author: John D. Conner, Jr.
  • "The TSCA Handbook," 4th Edition, Government Institutes (2006). Co-Author: John D. Conner, Jr.
  • "China's Regulation of Pesticides," Metropolitan Corporate Counsel (December 2005). Co-Author: John D. Conner, Jr.

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Firm News & Announcements

Aug.16.2019 The Best Lawyers in America 2020 Recognizes 49 Crowell & Moring Attorneys, Three Selected as Lawyer of the Year
Oct.15.2018 Super Lawyers Recognizes 82 Crowell & Moring Lawyers Across United States
Aug.15.2018 The Best Lawyers in America 2019 Recognizes 38 Crowell & Moring Attorneys
Oct.31.2017 The Best Lawyers in America 2018 Recognizes 40 Crowell & Moring Lawyers
Apr.26.2017 Lawyers Peter Gray and John D. Conner, Jr., Authorities in Chemicals and Pesticides Regulations, Join Crowell & Moring’s Environment & Natural Resources Group