Atty. John M Callaghan
John M Callaghan is a lawyer practicing antitrust & trade law, commercial, global litigation and 2 other areas of law. John received a degree from Creighton University School of Law, Omaha NE, and has been licensed for 54 years.
Antitrust & Trade Law & More Attorney · Serving Los Angeles, CA · 54+ Years Experience
Profile Summary
About John M Callaghan at a Glance
John M Callaghan is a business, ip, securities, litigation, and consumer attorney based in Los Angeles, California. They have 54+ years of legal experience, licensed to practice since 1972. Admitted to practice in California (1972). Educated at Creighton University School of Law (JD, 1966) and Creighton University School of Law, Omaha NE (—). Serves clients in Los Angeles, CA and the surrounding metropolitan area.
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About John M Callaghan
- John M Callaghan is a lawyer practicing antitrust & trade law, commercial, global litigation and 2 other areas of law
- John received a degree from Creighton University School of Law, Omaha NE, and has been licensed for 54 years
- John practices in Los Angeles, CA
Practice Areas Explained
John M Callaghan's Areas of Legal Practice
Each practice area below reflects the types of cases John M Callaghan handles, with a practical overview of what that area of law involves and how it may apply to your situation in Los Angeles.
Business & Corporate Law in Los Angeles
Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.
John M Callaghan is one of 497,491 business attorneys indexed nationally. Browse business attorneys in California →
Intellectual Property in Los Angeles
IP attorneys protect inventions, brands, and creative work through patent prosecution, trademark registration, copyright, and trade-secret enforcement.
John M Callaghan is one of 105,285 ip attorneys indexed nationally. Browse ip attorneys in California →
Securities Law in Los Angeles
John M Callaghan is one of 64,075 securities attorneys indexed nationally. Browse securities attorneys in California →
Civil Litigation in Los Angeles
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
John M Callaghan is one of 450,750 litigation attorneys indexed nationally. Browse litigation attorneys in California →
Consumer Protection in Los Angeles
Consumer protection attorneys for fraud, lemon law, debt harassment, and deceptive trade practices.
John M Callaghan is one of 50,226 consumer attorneys indexed nationally. Browse consumer attorneys in California →
Jurisdictional Context
Why Local Counsel Matters in Los Angeles
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 Los Angeles 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 venue, 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.
Los Angeles Courts and Legal Process
Choosing a Los Angeles-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
Looking for additional California attorneys? Browse all attorneys in Los Angeles or all attorneys in California.
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Professional Profile
Why Clients in Los Angeles Choose John M Callaghan
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish John M Callaghan's practice in the field of business, ip, securities, litigation, and consumer.
Decade-Tested Legal Experience
John M Callaghan brings 54+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Broad Practice Area Coverage
Covering business, ip, and securities, John M Callaghan can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Los Angeles
A Los Angeles-based practice means John M Callaghan attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
Case Types
Common Legal Issues John M Callaghan Handles in Los Angeles
Below is a representative sample of the types of matters John M Callaghan has experience with under California law. If your situation involves one of these case categories, this attorney may be well positioned to help you understand your options.
This list is illustrative, not exhaustive. Contact John M Callaghan directly to discuss the specifics of your situation.
Search Reference
How People Find John M Callaghan Online
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John M Callaghan's Practice Areas & Specializations
Education & Law School Background
Bar Admissions & Licensed Jurisdictions
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