Atty. David Mastan

Atty. David Mastan

Mr. Mastan joined the firm in 2014 as a Trial Attorney in the firm’s Southern California office.

Glendale Glendale 35 yrs experience 35 year
Call (747) 238-7032 Email Book Appointment

Profile Summary

About David Mastan at a glance

David Mastan is a Partner based in Glendale, California, practicing at Law Offices Of Stephenson Acquisto Colman. They have 35+ years of legal experience, licensed to practice since 1991. Their practice focuses on litigation, health care, and entertainment. Admitted to practice in California (1991), United States Court of Appeals for the Ninth Circuit (2014), United States District Court for the Central District of California (2014), and United States District Court for the Northern District of California (2014). Educated at Loyola Law School (J.D., 1989) and University of California - Los Angeles (B.A. Fuller, 1986). Serands clients in Glendale, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mr. Mastan joined the firm in 2014 as a Trial Attorney in the firm’s Southern California office
  • His practice is focused on representing major California acute care providers in state and federal civil actions, arbitrations, mediations, settlement negotiations and other reimbursement disputes between health plans and healthcare providers
  • Litigated issues typically involve interpretation of California’s Knox-Keene Act, the federal Employee Retirement Income and Security Act (“ERISA”), the federal Emergency Medical Treatment and Labor Act (“EMTALA”), as well as general contract disputes
  • Mr. Mastan has over 31 years of civil litigation experience and was previously the Division Managing Attorney for a major national insurance company
  • He has been a member of the California State Bar since 1991 and is admitted to practice before each Federal District Court in California, including the Ninth Circuit Court of Appeals
  • He obtained a bachelor’s degree from UCLA in 1986, his Juris Doctor degree from Loyola Law School in 1989, and a Master’s degree in theology from Fuller Theological Seminary in 1991
  • Mr. Mastan has been active with outreach programs to the homeless population of Pasadena, CA including Church in the Park and Helping Hands, as well as support programs for pediatric cancer patients at City of Hope Hospital, including the Desi Geestman Foundation and the TEAM Jessie program through Maranatha High School

Practice Areas Explained

David Mastan's Areas of Practice

Each practice area below reflects the types of cases David Mastan handles, with a brief overview of what that area of law covers.

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

David Mastan is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in California →

Health Care Law

Health care attorneys for HIPAA, Medicare, Medicaid, regulatory compliance, and medical licensing matters.

David Mastan is one of 66,735 health care attorneys indexed nationally. Browse health care attorneys in California →

Entertainment & Sports Law

Entertainment lawyers for music, film, sports contracts, talent representation, and IP licensing.

David Mastan is one of 45,946 entertainment attorneys indexed nationally. Browse entertainment attorneys in California →

Jurisdictional Context

Why local counsel matters in California

Practicing law in California. Legal matters in California are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Glendale 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 substantive 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 Glendale or all attorneys in California.

Frequently Asked

Common questions about David Mastan

Where is David Mastan's law office located?
David Mastan's law practice is located in Glendale, California. The firm is Law Offices Of Stephenson Acquisto Colman. You can contact the office directly through this profile page.
What practice areas does David Mastan handle?
David Mastan focuses on litigation, health care, entertainment. Each practice area listed reflects experience handling cases of that type in California.
How long has David Mastan practiced law?
David Mastan has 35+ years of legal experience and has been licensed since 1991.
Where did David Mastan go to law school?
David Mastan earned their education at (J.D., 1989); (B.A. Fuller, 1986).
How can I contact David Mastan for a consultation?
You can contact David Mastan 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

J.D.
Loyola Law School
- 1989
B.A. Fuller
University of California - Los Angeles
- 1986

Bar Admissions

California
Admitted: 1991
United States Court of Appeals for the Ninth Circuit
Admitted: 2014
United States District Court for the Central District of California
Admitted: 2014
United States District Court for the Northern District of California
Admitted: 2014
United States District Court of the Easter District of California
Admitted: 2014
United States District Court of the Southern District of California
Admitted: 2014
Washington
Admitted: 2016
Illinois
Admitted: 2018

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