Atty. Mark J. Jahnke

Atty. Mark J. Jahnke

Ask Mark Jahnke how he's doing, and he will tell you he's living the dream. And while every attorney knows on some days that might ring sarcastic, Mark regularly means it.

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Profile Summary

About Mark J. Jahnke at a glance

Mark J. Jahnke is a business and m&a attorney based in Cincinnati, Ohio, practicing at Katz Teller. Admitted to practice in Ohio, Ohio State Bar Association. Educated at Northwestern University (J.D., 1979) and The Ohio State University (B.A., 1976). Recognitions include Best Lawyers in America — Corporate Law (2026), Best Lawyers in America — Mergers and Acquisitions Law (2026), and Best Lawyers in America — Special Focus: (2026). Serands clients in Cincinnati, OH and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

Ask Mark Jahnke how he's doing, and he will tell you he's living the dream. And while every attorney knows on some days that might ring sarcastic, Mark regularly means it.

For him, the dream is the opportunity to work with clients to help them achieve their dreams. Because clients recognize that his level of care and concern is something unique, Mark is often asked to serve on client boards, advisory groups or in other capacities that allow him to work hand-in-hand with management to achieve business goals or navigate challenges and complexities.

While day-to-day client counseling frequently occupies a significant portion of Mark's workday, his reputation has been built on and staked to the special skill he brings to advising clients on mergers, acquisitions, divestitures and other major corporate transactions. Several times Mark has represented one party in a deal only to be hired later by the other party in connection with a separate transaction.

A long-time client describes Mark as “the kind of lawyer that every CEO dreams of hiring,” and the lawyer he would want on his side of the table in any negotiation. As that client recognized, Mark does not pretend to be an expert in every area, but involves the right people as needed to help clients avoid unnecessary legal adventures. This echoes Mark’s recognition in Chambers USA as an “astute business lawyer and negotiator who is very easy to deal with,” and who will "fight for the things that are important with great practical judgment and a sense of humor.”

As the President and CEO of Katz Teller, Mark is not only the face of the firm, but a force that drives us forward. Mark’s ability to bring out the best in those around him, along with his leadership and judgment, keep us focused on achieving the level of service our clients expect and deserve.

REPRESENTATIVE TRANSACTIONS

In addition to handling a variety of matters relating to business organizations, including formation, organizational structure, owner/shareholder relationships, business succession and related issues, and representation of C-level private and public company executives, Mark has represented a number of our clients, including those identified below, in significant acquisition, recapitalization and disposition transactions:

Practice Areas Explained

Mark J. Jahnke's Areas of Practice

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

Business & Corporate Law

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

Mark J. Jahnke is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Ohio →

Mergers & Acquisitions

Mark J. Jahnke is one of 49,731 m&a attorneys indexed nationally. Browse m&a 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 Cincinnati 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 Cincinnati or all attorneys in Ohio.

Frequently Asked

Common questions about Mark J. Jahnke

Where is Mark J. Jahnke's law office located?
Mark J. Jahnke's law practice is located in Cincinnati, Ohio. The firm is Katz Teller. You can contact the office directly through this profile page.
What practice areas does Mark J. Jahnke handle?
Mark J. Jahnke focuses on business, m&a. Each practice area listed reflects experience handling cases of that type in Ohio.
Where did Mark J. Jahnke go to law school?
Mark J. Jahnke earned their education at (J.D., 1979); (B.A., 1976); (M.A. (Joint Conferral), 1976).
How can I contact Mark J. Jahnke for a consultation?
You can contact Mark J. Jahnke 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 Mark J. Jahnke received?
Mark J. Jahnke's notable recognition includes: Best Lawyers in America — Corporate Law; Best Lawyers in America — Mergers and Acquisitions Law; Best Lawyers in America — Special Focus:; Best Lawyers in America — Closely-Held Businesses; Best Lawyers in America — Family Businesses.

Education

J.D.
Northwestern University
- 1979
B.A.
The Ohio State University
- 1976
M.A. (Joint Conferral)
The Ohio State University
- 1976
BA
The Ohio State University
- 1976
MA
The Ohio State University
- 1976

Awards

Best Lawyers in America — Corporate Law
- 2026
Best Lawyers in America — Mergers and Acquisitions Law
- 2026
Best Lawyers in America — Special Focus:
- 2026
Best Lawyers in America — Closely-Held Businesses
- 2026
Best Lawyers in America — Family Businesses
- 2026
Best Lawyers in America — General Corporate
- 2026
Best Lawyers in America — Health Care
- 2026
Best Lawyers in America — Leveraged Buyouts
- 2026
Best Lawyers in America — Mergers & Acquisitions
- 2026
Best Lawyers in America — Private Equity
- 2026
Best Lawyers in America — Awards:
- 2026
Best Lawyers in America — Woodward/White’s Best Lawyers in America “Lawyer of the Year”, Cincinnati, Corporate Law, 2012, 2014 & 2017
- 2026
Best Lawyers in America — Woodward/White’s Best Lawyers in America "Lawyer of the Year", Cincinnati, Mergers and Acquisitions Law, 2012 & 2015
- 2026
Lawyer of the Year — Mergers and Acquisitions Law (Cincinnati)
- 2025
Lawyer of the Year — Corporate Law (Cincinnati)
- 2021
Lawyer of the Year — Corporate Law (Cincinnati)
- 2017
Lawyer of the Year — Mergers and Acquisitions Law (Cincinnati)
- 2015
Lawyer of the Year — Corporate Law (Cincinnati)
- 2014
Lawyer of the Year — Corporate Law (Cincinnati)
- 2012
Lawyer of the Year — Mergers and Acquisitions Law (Cincinnati)
- 2012

Bar Admissions

Ohio, Ohio State Bar Association

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