Atty. William Joseph Mostyn IV

Atty. William Joseph Mostyn IV

William Joseph Mostyn IV is a lawyer practicing chemical intellectual property, electrical intellectual property, electronic intellectual property and 22 other areas of law. William received a M.A. degree from Boston University School of Medicine in 2006, and has been licensed for 16 years.

Boston Boston 16 yrs experience 16 year
Call (617) 228-4412 Book Appointment

Profile Summary

About William Joseph Mostyn IV at a glance

William Joseph Mostyn IV is a Senior Legal Counsel based in Boston, Massachusetts. They have 16+ years of legal experience, licensed to practice since 2010. Their practice focuses on real estate, ip, ip licensing, civil rights, and international. Admitted to practice in Massachusetts registered to practice before the U.S. Patent and Trademark Office (2010). Educated at Northeastern University School of Law (J.D., 2010) and Boston University School of Medicine (M.A. Medical, 2006). Active member of Boston, Massachusetts, and American Bar Associations American Chemical Society. Serands clients in Boston, MA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William Joseph Mostyn IV is a lawyer practicing chemical intellectual property, electrical intellectual property, electronic intellectual property and 22 other areas of law
  • William received a M.A. degree from Boston University School of Medicine in 2006, and has been licensed for 16 years
  • William practices in Boston, MA

Practice Areas Explained

William Joseph Mostyn IV's Areas of Practice

Each practice area below reflects the types of cases William Joseph Mostyn IV handles, with a brief overview of what that area of law covers.

Real Estate Law

Real estate attorneys handle home purchases, sales, commercial transactions, title disputes, and landlord-tenant matters.

William Joseph Mostyn IV is one of 316,149 real estate attorneys indexed nationally. Browse real estate attorneys in Massachusetts →

Intellectual Property

IP attorneys protect inventions, brands, and creative work through patent prosecution, trademark registration, copyright, and trade-secret enforcement.

William Joseph Mostyn IV is one of 106,079 ip attorneys indexed nationally. Browse ip attorneys in Massachusetts →

IP Licensing

William Joseph Mostyn IV is one of 2,744 ip licensing attorneys indexed nationally. Browse ip licensing attorneys in Massachusetts →

Civil Rights

Civil rights attorneys for discrimination, police misconduct, constitutional rights, and civil liberties cases.

William Joseph Mostyn IV is one of 70,245 civil rights attorneys indexed nationally. Browse civil rights attorneys in Massachusetts →

International Law

International law attorneys for cross-border transactions, trade, foreign investment, and treaties.

William Joseph Mostyn IV is one of 40,133 international attorneys indexed nationally. Browse international attorneys in Massachusetts →

Jurisdictional Context

Why local counsel matters in Massachusetts

Practicing law in Massachusetts. Legal matters in Massachusetts are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Boston are typically filed in the local municipal court or the appropriate Massachusetts state district court, depending on subject matter and amount in controversy. An attorney licensed in Massachusetts 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 Massachusetts courts without local counsel or pro hac vice admission.

Looking for additional Massachusetts attorneys? Browse all attorneys in Boston or all attorneys in Massachusetts.

Frequently Asked

Common questions about William Joseph Mostyn IV

Where is William Joseph Mostyn IV's law office located?
William Joseph Mostyn IV's law practice is located in Boston, Massachusetts. You can contact the office directly through this profile page.
What practice areas does William Joseph Mostyn IV handle?
William Joseph Mostyn IV focuses on real estate, ip, ip licensing, civil rights, international. Each practice area listed reflects experience handling cases of that type in Massachusetts.
How long has William Joseph Mostyn IV practiced law?
William Joseph Mostyn IV has 16+ years of legal experience and has been licensed since 2010.
Where did William Joseph Mostyn IV go to law school?
William Joseph Mostyn IV earned their education at (J.D., 2010); (M.A. Medical, 2006).
How can I contact William Joseph Mostyn IV for a consultation?
You can contact William Joseph Mostyn IV 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.
Northeastern University School of Law
- 2010
M.A. Medical
Boston University School of Medicine
- 2006

Bar Admissions

Massachusetts registered to practice before the U.S. Patent and Trademark Office
Admitted: 2010

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