Atty. John Hattery Siegenthaler

Atty. John Hattery Siegenthaler

John Hattery Siegenthaler is a lawyer practicing corporate, trust, health care and 8 other areas of law. John received a A.B. degree from Denison University in 1961, and has been licensed for 62 years.

Mansfield Mansfield 62 yrs experience 62 year
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Profile Summary

About John Hattery Siegenthaler at a glance

John Hattery Siegenthaler is a trusts, probate, estate planning, business, and real estate attorney based in Mansfield, Ohio. They have 62+ years of legal experience, licensed to practice since 1964. Admitted to practice in Ohio U.S. District Court, Northern District of Ohio (1964). Educated at The Ohio State University (J.D., 1964) and Denison University (A.B., 1961). Recognitions include AV Preeminent. Active member of Richland County (President, 1988) and Ohio State Bar Associations Ohio Society of Hospital Attorneys. Serands clients in Mansfield, OH and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John Hattery Siegenthaler is a lawyer practicing corporate, trust, health care and 8 other areas of law
  • John received a A.B. degree from Denison University in 1961, and has been licensed for 62 years
  • John practices in Mansfield, OH

Practice Areas Explained

John Hattery Siegenthaler's Areas of Practice

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

Trusts

John Hattery Siegenthaler is one of 104,171 trusts attorneys indexed nationally. Browse trusts attorneys in Ohio →

Probate

John Hattery Siegenthaler is one of 128,014 probate attorneys indexed nationally. Browse probate attorneys in Ohio →

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.

John Hattery Siegenthaler is one of 226,536 estate planning attorneys indexed nationally. Browse estate planning attorneys in Ohio →

Business & Corporate Law

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

John Hattery Siegenthaler is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Ohio →

Real Estate Law

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

John Hattery Siegenthaler is one of 316,149 real estate attorneys indexed nationally. Browse real estate attorneys in Ohio →

Jurisdictional Context

Why local counsel matters in Ohio

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

Looking for additional Ohio attorneys? Browse all attorneys in Mansfield or all attorneys in Ohio.

Frequently Asked

Common questions about John Hattery Siegenthaler

Where is John Hattery Siegenthaler's law office located?
John Hattery Siegenthaler's law practice is located in Mansfield, Ohio. You can contact the office directly through this profile page.
What practice areas does John Hattery Siegenthaler handle?
John Hattery Siegenthaler focuses on trusts, probate, estate planning, business, real estate. Each practice area listed reflects experience handling cases of that type in Ohio.
How long has John Hattery Siegenthaler practiced law?
John Hattery Siegenthaler has 62+ years of legal experience and has been licensed since 1964.
Where did John Hattery Siegenthaler go to law school?
John Hattery Siegenthaler earned their education at (J.D., 1964); (A.B., 1961).
How can I contact John Hattery Siegenthaler for a consultation?
You can contact John Hattery Siegenthaler 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.
What awards or recognition has John Hattery Siegenthaler received?
John Hattery Siegenthaler's notable recognition includes: AV Preeminent.

Education

J.D.
The Ohio State University
- 1964
A.B.
Denison University
- 1961

Awards

AV Preeminent

Bar Admissions

Ohio U.S. District Court, Northern District of Ohio
Admitted: 1964

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