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Atty. Mark A. Irwin

Atty. Mark A. Irwin

Mark A. Irwin is a Family Law Attorney and founding partner of IRWIN & IRWIN, LLP, with offices in Fullerton and Newport Beach, California.

Fullerton Fullerton 16 Years Experience 16 year
Call (657) 551-3391

Profile Summary

About Mark A. Irwin at a glance

Mark A. Irwin is a Managing Partner based in Fullerton, California, practforg at Irwin & Irwin, LLP. They haand 16+ years of legal experience, licensed to practice since 2010. Admitted to practice in California (2010). Educated at Western State University College of Law J.D. (—) and University of Southern California’s Annenberg School for Communication & Journalism (—). Serands clients in Fullerton, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mark A. Irwin is a Family Law Attorney and founding partner of IRWIN & IRWIN, LLP, with offices in Fullerton and Newport Beach, California
  • He is a graduate of the University of Southern California’s Annenberg School for Communication & Journalism
  • Mr. Irwin earned his Juris Doctor in Law from Western State University College of Law
  • He graduated from law school second in his class after earning three Witkin Awards for academic excellence
  • Mr. Irwin worked as a Family Law Attorney for another prominent firm before starting his own practice in 2011 with his wife, Kelly McGrane-Irwin
  • Mr. Irwin is a member of the California State Bar, and the Orange County Bar Association (OCBA)
  • He is also a member of the Family Law Sections of both the OCBA and the California Lawyers’ Association (CLA)
  • Mr. Irwin served on the Orange County Family Violence Council as a member of their Steering Committee from 2004 to 2009
  • He was instrumental in the development of the Orange County Family Justice Center, a one-stop, multi-agency facility in Orange County which provides services for victims of domestic violence, child abuse, sexual assault, and elder/dependent adult abuse
  • Mr. Irwin has almost thirty years of prior experience in law enforcement
  • His investigative background includes complex criminal and administrative law matters
  • Mr. Irwin served as the Vice-President of the non-profit Orange County Family Justice Center Foundation, Inc., from 2006-2009, and he is currently still a member of the Friends of the Foundation
  • Mr. Irwin has also been involved in his neighborhood youth soccer and Little League baseball organizations in past years
  • Mr. Irwin has served as a Mentor with the USC Annenberg Advantage Alumni-Student Mentoring Program
  • As part of this program he mentored seniors completing their undergraduate degrees at the University of Southern California, and helped prepare them to succeed in the “working world.” Mr. Irwin has served as a guest lecturer on Family Law, and Ethics in Family Law, at Western State University College of Law
  • He has also served as a Moot Court competition judge at WSU law school, and has authored several published articles on family law issues
  • Mr. Irwin limits his practice exclusively to Family Law matters
  • He currently accepts cases in Orange, Riverside, San Bernardino and Los Angeles Counties

Jurisdictional Context

Why local counsel matters in California

Practforg law in California. Legal matters in California are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantiand law. Cases originating in Fullerton are typically filed in the local municipal court or the appropriate California state district court, depending on subject matter and amount in controversy. An attorney licensed in California brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantiand law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in California courts without local counsel or pro hac vice admission.

Looking for additional California attorneys? Browse all attorneys in Fullerton or all attorneys in California.

Frequently Asked

Common questions about Mark A. Irwin

Where is Mark A. Irwin's law office located?
Mark A. Irwin's law practice is located in Fullerton, California. The firm is Irwin & Irwin, LLP. You can contact the office directly through this profile page.
How long has Mark A. Irwin practiced law?
Mark A. Irwin has 16+ years of legal experience and has been licensed since 2010.
Where did Mark A. Irwin go to law school?
Mark A. Irwin earned their education at (—); (—).
How can I contact Mark A. Irwin for a consultation?
You can contact Mark A. Irwin directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

Western State University College of Law J.D.
- In Progress
University of Southern California’s Annenberg School for Communication & Journalism
- In Progress

Bar Admissions

California
Admitted: 2010

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