• University of California, Santa Barbara, B.A. (2012)
  • Loyola Law School, Los Angeles, J.D. (2017)


  • California

Sigourney R. Haylock


Sigourney Haylock is an associate 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 healthcare 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.

Sigourney received her J.D. from Loyola Law School where 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. While in law school, Sigourney worked as a judicial extern for the Honorable André Birotte, Jr. in the United States District Court for the Central District of California. She graduated from the University of California, Santa Barbara where she received a B.A. in environmental studies and a minor in global peace and security.


Admitted to practice: 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

May 13, 2021 The National Black Lawyers Selects Crowell & Moring Lawyers as Top 100 and Top 40 Under 40 Members