Daniel Mensher

Daniel Mensher: Attorney with Keller Rohrback L.L.P.
  • Attorney at Keller Rohrback L.L.P. (70 Attorneys)
  • 1201 Third Avenue, Suite 3200, Seattle, WA 98101
    View Daniel Mensher's office location
  • Peer Reviews

    4.4/5.0 (6)
  • Profile Visibility [ i ]
    • #348 in weekly profile views out of 14,792 Attorneys in Seattle, WA
    • #56,617 in weekly profile views out of 1,830,987 total attorneys Overall
Attorney Awards


Daniel Mensher translates thorough preparation into courtroom success. Dan practices in Keller Rohrback’s nationally recognized Complex Litigation Group with a focus on complex environmental and consumer protection litigation. He enjoys collaborating with his colleagues and clients to identify problems and find creative, convincing solutions.

Dan has litigated important environmental and consumer cases across the country in federal and state court. He’s part of the Keller Rohrback team representing more than 50 counties, cities, tribes, and insurance pools in the fight to hold drug manufacturers and other entities accountable for the opioid crisis.

Before joining the firm, Dan was an environmental law professor at Lewis & Clark Law School in Portland, Oregon, where he also litigated cases involving toxic waste, water pollution, and natural resource management. He has sat on governmental advisory boards and helped to draft key environmental regulations in place today. Dan uses his passion and experience to protect our environment and the people and communities that rely on clean air, water, and products.

Recent Posts

Keller Rohrback Files Suits on Behalf of Skagit County, Mount Vernon, Sedro-Woolley, and Burlington Against Opioid Manufacturers

King County and Keller Rohrback File Suit Against Opioid Manufacturers

Oregon Sues Monsanto, With the Help of Keller Rohrback, Over Toxic PCBs

More Cities and Governments File Suit Against Prescription Opioid Manufacturers

Keller Rohrback Files Suit Against Prescription Opioid Manufacturers

Court Grants Preliminary Approval of $142 Million Settlement in Wells Fargo Unauthorized Accounts Class Action

Court Grants Final Approval to 3.0-Liter Class Action Settlement & Bosch Class Action Settlement

Keller Rohrback L.L.P.: Plaintiffs in Wells Fargo Account Scandal Seek Court Approval for $142 Million Settlement

Keller Rohrback: Plaintiffs in Wells Fargo Account Scandal Seek Court Approval for $142 Million Settlement

Preliminary Approval of VW/Audi/Porsche 3-liter and Bosch Settlements in Volkswagen Clean Diesel Litigation

Bosch Agrees To $327.5 Million Settlement in VW Diesel Emissions Fraud Case

Settlement Agreement Filed for Volkswagen, Audi, Porsche 3.0-Liter

Important Info for Owners of TDI 3.0-Liter VWs/Audis/Porsches

Court Grants Final Approval 2.0-Liter Settlement

Volkswagen Litigation Update - 8/25/2016

Volkswagen Litigation Update - Preliminary Approval of VW Settlement Granted

Volkswagen Litigation Case Update

Volkswagen and Audi 2.0-Liter Emissions Settlement

Keller Rohrback L.L.P. Investigates High Levels of Lead in Children’s Cra-Z-Art Kits

VW Litigation Case Update

KR Investigating Claims Against Precision Castparts For Heavy Metal Pollution in Oregon

Keller Rohrback Investigates Claims Against Portland Glass Manufacturers For Arsenic and Cadmium Pollution

Keller Rohrback Files Class Action Lawsuit Against SoCalGas on Behalf of Porter Ranch Residents

Keller Rohrback Investigates Claims of Diesel Porsche Cayenne Consumers

JPML Sends VW Lawsuits to San Francisco

Class Action Lawsuit Filed on Behalf of Those Affected by Refugio Oil Spill

Village of Rockton Fights Abandoned Sonoco Paper Mill Contamination

Keller Rohrback Files Suit on Behalf of Porsche, Audi, and VW Consumers

Keller Rohrback Warns Consumers About VW Goodwill Package

Keller Rohrback Expands Nationwide Class Action Lawsuit Against VW

KR Launches Investigation After EPA Adds Audi & Porsche to VW Clean Air Act Violation

Keller Rohrback Files Nationwide Class Action Lawsuit Against Volkswagen

VW Emissions Scandal

Volkswagen's Alleged Violation of Clean Air Standards

Volkswagen Investigated by EPA Over Clean Air Standards

Volkswagen Violates Clean Air Act

Volkswagen Class Action Complaint Expands To Include Affected Porsche and Audi Vehicles

KR Asks Federal Judge to Prohibit VW and Audi From Making Misleading Statements to Drivers

Keller Rohrback Investigates Oil Company Price Fixing

Keller Rohrback Asks Judge To Stop Misleading Communications

Volkswagen News From Around The Web

Volkswagen Help Center - Useful Links

KR attorney Dan Mensher discusses environmental impact of VW Dieselgate

Meet the Keller Rohrback Volkswagen Team

Keller Rohrback Advocates for Volkswagen Diesel Consumers Nationwide in Class Action

Articles & Presentations

Speaker, Bridgeport Environmental Class Action Webinar, March 2016

Speaker, Harris Martin Porter Ranch Gas Leak Litigation Conference, “Testing of the Air Quality and Expert Witnesses for the Cases,” 19 January 2016

Daniel P. Mensher, With Friends Like These...: The Trouble With Auer Deference, 43 Envtl. Law Rev. 4 (2013)

Speaker, Oregon Water Law Conference, November 7, 2013 (Addressing issues in Water Quality Trading)

Speaker, Northwest Environmental Conference and Tradeshow, December 11, 2013 (The Precautionary Principle in Environmental Law)

Speaker, RainOps Conference, 2013, Spokane, WA, Longview, WA (Clean Water Act stormwater regulation)

Presenter, Oregon State Bar Environmental and Natural Resources Committee annual Continuing Legal Education Program, 2013 (salmon issues in Oregon and the Pacific Northwest)

Speaker, Oregon State Bar brown bag CLE debate with Oregon DOJ assistant attorney general about the Supreme Court case Decker v. NEDC, 2012

Daniel P. Mensher, Common Law On Ice: Using Federal Nuisance Law to Address Global Warming, 37 Envtl. Law Rev. 2 (2007)

Chris Rycewicz and Dan Mensher, Growing State Authority Under the Clean Water Act, 22 Nat. Resources & Env’t 2 (2007)

Areas of Practice (5)

  • Class Action and Consumer Litigation
  • Consumer and Data Privacy Protection
  • Environmental Litigation
  • Governments and Municipalities
  • Mass Personal Injury

Education & Credentials

Contact Information:
206.623.1900  Phone
206.623.3384  Fax
University Attended:
University of Wisconsin, M.S., Geography, 2002; Wesleyan University, B.A., History, 1998
Law School Attended:
Lewis & Clark Law School, J.D., cum laude, Environmental Law Certificate, Cornelius Honors Society, Articles Editor, Environmental Law Review, 2007
Year of First Admission:
2010, U.S. District Court for the District of Columbia Circuit; 2008, U.S. Court of Appeals for the Ninth Circuit; 2011, U.S. District Court for the Western District of Wisconsin; 2014, U.S. District Court for the Eastern District of Washington; 2014, U.S. District Court for the Western District of Washington; 2007, Oregon; 2014, Washington; 2008, U.S. District Court for the District of Oregon

Professional and Civic Involvement

Oregon State Bar Association, Member

Washington State Bar Association, Member

Toxic Free Future, Board Member

Northwest Environmental Defense Center, Board Member

Birth Information:
Iowa City, Iowa, December 6, 1975
Reported Cases:
Current Cases: Santa Barbara Oil Spill; Wells Fargo Unauthorized Accounts
Payment Information:
  • Credit cards accepted
  • Accepts Visa, MasterCard and Other

Peer Reviews

4.4/5.0 (6 reviews)
Peer Reviewed
  • Legal Knowledge

  • Analytical Capability

  • Judgment

  • Communication

  • Legal Experience


*Peer Reviews provided before April 15, 2008 are not displayed.

Seattle, Washington

Contact Daniel Mensher

Required Fields

Required Fields

By clicking on the "Submit" button, you agree to the Terms of Use, Supplemental Terms and Privacy Policy. You also consent to be contacted at the phone number you provided, including by autodials, text messages and/or pre-recorded calls, from Martindale and its affiliates and from or on behalf of attorneys you request or contact through this site. Consent is not a condition of purchase.

You should not send any sensitive or confidential information through this site. Emails sent through this site do not create an attorney-client relationship and may not be treated as privileged or confidential. The lawyer or law firm you are contacting is not required to, and may choose not to, accept you as a client. The Internet is not necessarily secure and emails sent though this site could be intercepted or read by third parties.