Ann Claassen

  • Counsel
  • 555 Eleventh Street, NW
  • Suite 1000
  • Washington, D.C. 20004-1304
  • USA
  • T +1.202.637.2229


Ann Claassen is counsel with the Latham & Watkins’ Environment, Land & Resources Department. She regularly advises clients on matters arising under TSCA, FIFRA, EPCRA, CAA, CWA, RCRA, CERCLA, FFDCA, CPSA, Prop 65, REACH and other regulatory and voluntary programs of federal, state and foreign agencies, particularly with respect to chemical assessment and management. Ms. Claassen enables companies to understand exactly how regulatory programs do and don’t apply to their operations. She is able to understand the company’s scientific and technical parameters and how those specifics fit within complex regulatory mazes. She helps clients to understand how the regulators think and how to tailor their programs and advocacy accordingly. Her written analyses of the application of regulatory law to the client’s facts are lucid and instructive. Ms. Claassen provides compliance counseling, advocates with agencies—including EPA, FDA, CPSC, NTP, CDC, DOT, OSHA, CARB, OEHHA, Environment Canada and Health Canada—assists clients in enforcement matters, and assists clients with product stewardship and communications issues. Much of her work involves integration of legal principles with toxicology and risk assessment science, and she is an excellent translator between lawyers and technical personnel.

Ms. Claassen is a co-author of the Environmental Law Institute (ELI) ELR TSCA Deskbook (2nd Edition) and of the ELR Pesticide Regulation Deskbook . She has taught the TSCA portion of the NYU Summer Institute in Environmental Law, the Chemical Regulation portion of the ELI Western Environmental Law Bootcamp, and has made presentations at various other environmental seminars and conferences.

Ms. Claassen received her BA in Biochemistry from Colorado College and undertook graduate studies in Physical Chemistry at the University of New Mexico. Prior to entering law school, she worked as an environmental consultant focusing on water quality and water resource issues, and she headed the ground water monitoring portion of the New Mexico RCRA program in the mid-1980’s.

Ms. Claassen received her JD from the University of New Mexico in 1989. She clerked for Judge James M. Sprouse, US Court of Appeals for the Fourth Circuit, for a year prior to beginning her practice with Latham in Washington, D.C. In 2006-2008, she took a sabbatical in the San Francisco Bay area, tutoring high school students in chemistry and various other subjects.

Thought Leadership

  • EPA to Cease Issuing CBI Notices of Deficiency Under TSCA -  August 08, 2019
  • A Look At New EPA Composite Wood Formaldehyde Limits -  January 31, 2017
  • Environmental Protection Agency Adopts National Limits on Formaldehyde Exposure for Composite Wood Products  -  January 18, 2017
  • State Regs. Could Slip Through Holes In Fed. Microbead Ban -  January 19, 2016
  • Microbeads Banned in Cosmetics and Toothpaste -  December 23, 2015
  • Clean Energy Law Report: EPA Proposes Renewable Fuel Standards for 2014-2016  -  June 01, 2015
  • EPA Indefinitely Extends 2013 RFS Compliance Deadlines, Final 2014 RFS Still Awaited -  August 08, 2014
  • Clean Energy Law Report: RFS Update - EPA Extends 2013 RFS Compliance Deadlines, Final 2014 RFS on Deck  -  June 18, 2014
  • EPA Proposes Unprecedented Greenhouse Gas Emission Reduction Program  -  June 6, 2014
  • Hydraulic Fracturing Update: Legal Developments and Trends - Q&A -  April 7, 2014
  • FDA’s Final Guidance Distinguishes Liquid Dietary Supplements from Beverages -  February 05, 2014
  • EPA Proposes Reducing Renewable Fuel Mandate, Citing Market Issues and Technical Constraints -  January 02, 2014
  • Are You Set for the TSCA Reset? -  February 17, 2009
  • New EPA Interpretation Puts Ceramic, Glass, Frit, Alloy and Cement Products at Legal and Business Risk -  June 11, 2008
Ms. Claassen “has taken the time to understand our industry...She has been a real asset to me and my company in helping promote product stewardship for our industry.”Jim Chapman, Director, Product Safety (retired), Bayer MaterialScience
Bar Qualification
  • District of Columbia
  • JD, University of New Mexico School of Law, 1989
    summa cum laude; Order of the Coif
  • BA, Colorado College, 1975
    magna cum laude; Phi Beta Kappa
  • Oil & Gas
  • Industrials & Manufacturing
  • Retail & Consumer Products
  • Environment, Land & Resources
  • Product Liability, Mass Torts & Consumer Class Actions
  • Environmental Litigation
  • FDA Regulatory