DTO Law is a law firm based in Los Angeles, California.^[1] It was founded in 2019 by William A. Delgado, Megan O’Neill, and Mark M. Tarango.^[2] The firm also has offices in Silicon Valley (Redwood City) and New York City.^[3][4]

== History ==

Delgado and O’Neill launched DTO Law in 2019 and previously practiced at the litigation boutique Willenken.[5] Tarango joined from Sanchez & Amador and had served as managing counsel at Toyota Motor Credit Corporation.[6] In July 2022, the firm opened a New York office and added a former federal prosecutor and an intellectual property litigator from Weil, Gotshal & Manges.[7] The Recorder reported clients including American Honda, Costco, Google, Microsoft, PayPal, Target, and Walgreens.[8]

== Practice ==

Chambers USA ranks the firm in Litigation: General Commercial – Highly Regarded in California and describes work in class actions, complex commercial disputes, and intellectual property matters.[9] Coverage of the New York opening also noted white‑collar defense and investigations work.[10] Benchmark Litigation maintains a profile of the firm’s California practice.[11]

== Notable matters ==

* Diece‑Lisa Industries, Inc. v. Disney Store USA, LLC, et al. (U.S. Supreme Court No. 22‑347). In 2023, the Supreme Court vacated the Ninth Circuit’s decision and remanded for reconsideration in light of Jack Daniel’s v. VIP Products; the docket lists William A. Delgado as counsel of record for the petitioner.[12][13][14]

* Lululemon Athletica Canada Inc. v. Costco Wholesale Corporation (C.D. Cal. No. 2:25‑cv‑05864). Filed June 27, 2025. National outlets reported on the case, and the docket lists appearances for Costco.[15][16][17]

== Rankings and recognition ==

* Chambers USA (2025): Litigation: General Commercial – Highly Regarded (California).[18]

* Chambers Diversity & Inclusion Awards, North America (2021): Outstanding Firm for Diversity & Inclusion (winner).[19]

* Los Angeles & San Francisco Daily Journal “Top Boutiques” (2023) — firm profile.[20]

* Vault Law (Firsthand) 2025 midsize rankings: No. 1 for Diversity among midsize firms (publisher announcement).[21]

* California Lawyers Association (2022): Diversity Award (Law Firm recipient).[22]

* Los Angeles Business Journal (2023): Wells Fargo DEI Small Business Award — company of the year (small business).[23]

* Benchmark Litigation: firm profile and listings (California).[24]

== Founders and leadership ==

* William A. Delgado — founding and managing partner. Counsel of record in Diece‑Lisa Industries, Inc. v. Disney (No. 22‑347). Listed on Forbes 2025 “America’s Top 250 Lawyers.”[25][26][27]

* Megan O’Neill — founding partner. Recognized in the Daily Journal “Top Women Lawyers” (2021 and 2023).[28]

* Mark M. Tarango — founding partner. Former corporate partner at Sanchez & Amador and managing counsel at Toyota Motor Credit Corporation.[29]

== Memberships ==

DTO Law is a member firm of the National Association of Minority and Women Owned Law Firms (NAMWOLF).[30]

== Offices ==

* Los Angeles, California

* Silicon Valley (Redwood City), California

* New York City, New York[31][32]

== References ==

== External links ==

* Official website

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DTO Law is an American law firm founded in 2019 by William A. Delgado, Megan O’Neill and Mark M. Tarango. The firm advises companies in complex business disputes, including consumer class actions and intellectual property litigation, and also maintains a white‑collar and investigations practice.^[1][2] DTO Law has offices in Los Angeles, Silicon Valley, and New York City.^[3][4]

DTO Law was launched in Los Angeles and Silicon Valley in 2019 by Delgado and O’Neill, who departed the litigation boutique Willenken, and by Tarango, a former corporate partner at Sanchez & Amador and managing counsel at Toyota Motor Credit Corporation.^[5] In July 2022 the firm opened a New York office, adding a former federal prosecutor and an intellectual‑property litigator from Weil, Gotshal & Manges; reporting on the expansion identified clients including American Honda, Costco, Google, Microsoft, PayPal, Target, and Walgreens.^[6]

Chambers USA ranks the firm in Litigation: General Commercial – Highly Regarded in California and notes the firm’s work in class actions and complex commercial disputes, as well as intellectual‑property matters.^[7] Coverage of the firm’s New York expansion also highlighted activity in white‑collar defense and investigations alongside IP and commercial litigation.^[8] Benchmark Litigation profiles the firm’s California practice in commercial, consumer and IP litigation.^[9]

• Diece‑Lisa Industries, Inc. v. Disney Store USA, LLC et al. (U.S. Supreme Court No. 22‑347). In 2023 the Supreme Court granted certiorari, vacated, and remanded to the Ninth Circuit for reconsideration in light of Jack Daniel’s v. VIP Products; William A. Delgado of DTO Law served as counsel of record for the petitioner.^[10][11][12]

• Lululemon Athletica Canada Inc. v. Costco Wholesale Corp. (C.D. Cal. No. 2:25‑cv‑05864). DTO Law appears for defendant Costco; media coverage has described the case as testing the treatment of so‑called “dupe” products in trademark and trade‑dress law.^{[13][14][15][16]}

• Chambers USA (2025): Litigation: General Commercial – Highly Regarded (California).^[17]

• Chambers Diversity & Inclusion Awards, North America (2021): Outstanding Firm for Diversity & Inclusion (winner).^[18]

• Los Angeles & San Francisco Daily Journal “Top Boutiques” list (2023); firm profile featured.^[19][20]

• Vault Law (Firsthand) 2025 midsize rankings: #1 Best Midsize Law Firm for Diversity (category winner).^[21]

• California Lawyers Association (2022): firm listed among recipients of the statewide Diversity Award.^[22]

• Los Angeles Business Journal (2023): Wells Fargo DEI Small Business Award (DEI Company of the Year — Small Business).^[23][24]

• Benchmark Litigation (multiple years): firm profiled and attorneys recognized in national and California guides.^[25]

• William A. Delgado', founding and managing partner. Delgado has served as counsel of record before the U.S. Supreme Court and in high‑profile federal litigation; he was also named to Forbes 2025 list of America’s Top 250 Lawyers.^[26][27]

• Megan O’Neill, founding partner. O’Neill was recognized by the Daily Journal among California’s Top Women Lawyers (2021 and 2023); she has been profiled in regional legal media for her complex‑litigation work.^[28][29]

• Mark M. Tarango, founding partner. Prior to the firm’s launch, Tarango was a corporate partner at Sanchez & Amador and served as managing counsel at Toyota Motor Credit Corporation; reporting credits him with building out the firm’s corporate and real‑estate capabilities.^[30]

DTO Law is a certified minority‑owned firm and a member of the National Association of Minority and Women Owned Law Firms (NAMWOLF).^[31]

• Los Angeles, California

• Silicon Valley, California

• New York City, New York^[32]

• List of largest law firms by profits per partner

• Official website