Atty. Gary Steven Costello

Atty. Gary Steven Costello

Gary Steven Costello is a lawyer practicing trusts and estates, estate planning, wills and 5 other areas of law. Gary received a B.S. degree from California Polytechnic State University in 1976, and has been licensed for 30 years.

Dublin Dublin 30 yrs experience 30 year
Call (925) 568-1015 Book Appointment

Profile Summary

About Gary Steven Costello at a glance

Gary Steven Costello is a Member based in Dublin, California, practicing at Law Firm of Steve Costello. They have 30+ years of legal experience, licensed to practice since 1996. Their practice focuses on wills, trusts, probate, estate planning, and business. Admitted to practice in California (1996). Educated at Golden Gate University (J.D., 1986) and California Polytechnic State University (B.S., 1976). Active member of State Bar of California American Bar Association. Serands clients in Dublin, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Gary Steven Costello is a lawyer practicing trusts and estates, estate planning, wills and 5 other areas of law
  • Gary received a B.S. degree from California Polytechnic State University in 1976, and has been licensed for 30 years
  • Gary practices at Law Firm of Steve Costello in Dublin, CA

Practice Areas Explained

Gary Steven Costello's Areas of Practice

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

Wills

Gary Steven Costello is one of 34,541 wills attorneys indexed nationally. Browse wills attorneys in California →

Trusts

Gary Steven Costello is one of 104,171 trusts attorneys indexed nationally. Browse trusts attorneys in California →

Probate

Gary Steven Costello is one of 128,014 probate attorneys indexed nationally. Browse probate attorneys in California →

Estate Planning & Probate

An estate planning attorney prepares wills, trusts, powers of attorney, and healthcare directives to protect your family and pass on your assets.

Gary Steven Costello is one of 226,536 estate planning attorneys indexed nationally. Browse estate planning attorneys in California →

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

Gary Steven Costello is one of 501,317 business attorneys indexed nationally. Browse business 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 Dublin 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 Dublin or all attorneys in California.

Frequently Asked

Common questions about Gary Steven Costello

Where is Gary Steven Costello's law office located?
Gary Steven Costello's law practice is located in Dublin, California. The firm is Law Firm of Steve Costello. You can contact the office directly through this profile page.
What practice areas does Gary Steven Costello handle?
Gary Steven Costello focuses on wills, trusts, probate, estate planning, business. Each practice area listed reflects experience handling cases of that type in California.
How long has Gary Steven Costello practiced law?
Gary Steven Costello has 30+ years of legal experience and has been licensed since 1996.
Where did Gary Steven Costello go to law school?
Gary Steven Costello earned their education at (J.D., 1986); (B.S., 1976).
How can I contact Gary Steven Costello for a consultation?
You can contact Gary Steven Costello 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.
Golden Gate University
- 1986
B.S.
California Polytechnic State University
- 1976

Bar Admissions

California
Admitted: 1996

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