Atty. James G. "Jim" DeJong
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.
Profile Summary
About James G. "Jim" DeJong at a glance
James G. "Jim" DeJong is a business, m&a, and securities attorney based in Milwaukee, Wisconsin, practicing at O'Neil, Cannon, Hollman, DeJong & Laing SC. Admitted to practice in Wisconsin, State Bar of Wisconsin. Educated at Marquette University (J.D., 1978). Recognitions include Best Lawyers in America — Corporate Law (2026), Best Lawyers in America — Mergers and Acquisitions Law (2026), and Best Lawyers in America — Securities / Capital Markets Law (2026). Serands clients in Milwaukee, WI and the surrounding metropolitan area.
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About
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.)
Practice Areas Explained
James G. "Jim" DeJong's Areas of Practice
Each practice area below reflects the types of cases James G. "Jim" DeJong handles, with a brief overview of what that area of law covers.
Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.
James G. "Jim" DeJong is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Wisconsin →
James G. "Jim" DeJong is one of 49,731 m&a attorneys indexed nationally. Browse m&a attorneys in Wisconsin →
James G. "Jim" DeJong is one of 64,529 securities attorneys indexed nationally. Browse securities attorneys in Wisconsin →
Jurisdictional Context
Why local counsel matters in Wisconsin
Practicing law in Wisconsin. Legal matters in Wisconsin are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Milwaukee are typically filed in the local municipal court or the appropriate Wisconsin state district court, depending on subject matter and amount in controversy. An attorney licensed in Wisconsin 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 Wisconsin courts without local counsel or pro hac vice admission.
Looking for additional Wisconsin attorneys? Browse all attorneys in Milwaukee or all attorneys in Wisconsin.
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