James G. "Jim" DeJong
O'Neil, Cannon, Hollman, DeJong & Laing S.C.
Recognized since 2010
Milwaukee, Wisconsin
Corporate Law
Mergers and Acquisitions Law
Securities / Capital Markets Law
Jim’s practice focuses on representing privately held businesses and their owners on the wide variety of legal matters that may arise. This includes extensive experience with significant corporate transactions such as purchases and sales of businesses, complex contractual matters, and planning for business succession. In his practice, Jim works with clients across a wide range of industries, including fintech, manufacturing, distribution, and professional services. Jim has a unique perspective on the challenges of running a successful business having served as O’Neil Cannon’s President and Managing Shareholder for more than 25 years.
A cornerstone of Jim’s practice is building strong relationships with the clients’ owners and senior management. Jim’s experience has shown that effective legal counsel begins with a deep understanding of his clients’ businesses. This better positions him to provide tailored solutions that align with the clients’ goals and objectives. Jim and the law firm prioritize providing excellent legal work and exceptional client service delivered with efficiency, clarity, and practicality to minimize legal obstacles while maximizing opportunities for success.
Jim Assists Clients With
- mergers, acquisitions, sales and recapitalizations of businesses;
- shareholder agreements and operating agreements;
- securities law matters, including private offerings of debt and equity securities;
- restrictive covenants and nondisclosure agreements; and
- day to day legal and business issues, governance, compliance, and operational matters.
Jim’s Approach
Jim has a proven track record of applying his decades of experience and common sense to help clients navigate legal challenges with confidence. Whether a client is planning a sale of a business, acquisition of another business, or seeking guidance on general legal matters, Jim is dedicated to delivering results-driven solutions that support long-term success.
Awards/Distinctions
- State Bar of Wisconsin
- American Bar Association
- Wisconsin Chapter of Association for Corporate Growth (ACG)
Awards/Distinctions
- Peer review rated as AV Preeminent®, the highest rating in the Martindale-Hubbell® Peer Review Rating™ System
- Selected by his peers for inclusion in the Best Lawyers in America© (2010 - present) in the fields of corporate law, mergers and acquisitions, and securities/capital markets law
- Selected for inclusion in the Wisconsin Super Lawyers list (2007- present)
- Recipient of Carroll University’s MacAllister Distinguished Alumni Award (2019)
Community Involvement
- Served for nine years on the Board of Trustees of Carroll University, including three years as Board Chair.
- Has been involved as a Board Member of the Milwaukee Repertory Theater and the Friends of Art of the Milwaukee Art Museum
- Board Member, Thelma Sadoff Center for the Arts, Fond du Lac, Wisconsin
- Ordained Elder, Presbyterian Church of United States of America
Education
- Marquette University Law School (J.D.)
- Carroll University (B.S.)
- E-mail: jim.dejong@wilaw.com
- Direct Phone Number: 414-276-5000
- Phone Number: 414-276-5000
- Lawyer Page: https://www.wilaw.com/attorney/james-g-dejong/
- 111 East Wisconsin Avenue, Suite 1400
Milwaukee, WI 53202
- English
- Marquette University, J.D., graduated 1978
- Wisconsin, State Bar of Wisconsin
- Association for Corporate Growth, Wisconsin - Member
- Carroll University - Chair of the Board of Trustees
- Crossroads Presbyterian Church - Ordained Elder
- Friends of Art of the Milwaukee Art Mueseum - Former Board Member
- Milwaukee Repertory Theater - Former Board Member
20 The Best Lawyers in America® awards
5 Best Lawyers: Ones to Watch® in America awards

- Corporate Law
- Mergers and Acquisitions Law
- Securities / Capital Markets Law
- Regulatory
- Recipient of the 2019 P.E. MacAllister Distinguished Alumnus Award, presented by Carroll University
- Named one of “Milwaukee’s Leading Lawyers” in 2013, 2014, and 2015–Business, M Magazine
- Selected for inclusion in Wisconsin Super Lawyers in 2005–2023 Law & Politics and Milwaukee Magazine
- Selected for inclusion in The Best Lawyers in America® in 2010–2024 Corporate Law, Mergers & Acquisitions Law, Securities/Capital Markets Law
- Recipient of an AV Preeminent™ 5.0 out of 5.0 rating by Martindale-Hubbell®
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