• University of California, Santa Barbara, B.A. Environmental Studies, Minor in Global Peace and Security (2012)
  • Loyola Law School, Los Angeles, J.D. (2017)


  • California
  • U.S. District Court, Central District of California

Sigourney R. Haylock


Sigourney Haylock is a counsel in Crowell & Moring’s Los Angeles office and is a member of the firm’s Commercial Litigation and Mass Tort, Product, and Consumer Litigation groups.

Sigourney focuses her practice on complex commercial litigation, including commercial contract disputes, products liability, false advertising, IP, and health care litigation. Sigourney also counsels consumer products and food industry clients on alleged Prop 65 violations and threatened litigation.

In 2021, Sigourney was recognized as a "Top 40 under 40" lawyer by The National Black Lawyers, an organization that recognizes lawyers who have a reputation for providing excellent legal representation and who are leaders in their respective practice areas.

While in law school, Sigourney she served as a note and comment editor for the Loyola of Los Angeles Law Review and as a certified law student for Loyola’s Youth Justice Education Clinic. Sigourney worked as a judicial extern for the Honorable André Birotte, Jr. in the U.S. District Court for the Central District of California. 

Speeches & Presentations

  • "Prop 65 Update, Notice of Proposed Rulemaking: Amendments to Short-form Warnings," Retail Industry Leaders Association, Consumer Products Committee Monthly Call (February 9, 2021). Presenter: Sigourney R. Haylock.


Client Alerts & Newsletters

Firm News & Announcements

January 9, 2023 Crowell & Moring Elects 16 New Partners, Promotes Five to Senior Counsel, and 25 to Counsel
May 13, 2021 The National Black Lawyers Selects Crowell & Moring Lawyers as Top 100 and Top 40 Under 40 Members