Attorney Martin J. Greenberg is a trusted expert witness with more than five decades of legal experience in Real Estate and Sports Law. Known for his clear analysis, authoritative insight, and ability to simplify complex issues, his testimony withstands the highest level of scrutiny in even the most challenging cases.
Mr. Greenberg’s distinguished career is built on exceptional legal judgment, strategic thinking, and an unwavering commitment to excellence. Beyond his practice, he served as a Professor of Law at Marquette University Law School for 20 years, where he developed and taught Real Estate Law courses. He also founded the prestigious National Sports Law Institute and taught Sports Law for 30 years, influencing the careers of countless legal professionals.
A widely respected scholar and thought leader, Mr. Greenberg has authored numerous publications, delivered lectures worldwide, and has been retained regularly in high-profile matters requiring expert testimony. His unique combination of practical experience, academic achievement, and professional credibility makes him an invaluable resource for courts, clients, and the legal community.
The Law Office of
Martin J. Greenberg
5555 North Port Washington Rd
Suite 305
Glendale, WI 53217
Tel: (414) 271-4849
Fax: (414) 271-1884
Areas Greenberg is Qualified as a Legal Expert:
Real Estate Law
- Residential and Commercial Real Estate Transactions
- Condominiums, including Condominium Documents, Condominium Governance, Board of Directors Fiduciary Duties and Obligations, Rules and Regulations and legal impact, Enforcement of Condominium Documents
- Land contracts and installment sales
- 1031 Exchanges
- Real Estate Boundary Disputes
- Real Estate Title Disputes
- Real Estate Professional Practices, including Brokerage Law and Liability Prevention
- Standard of Care for Lawyers Practicing Real Estate Law
Sports Facility Development
- Financing
- Public/Private Partnerships
- Facility Leases
- Sports Facility Contracts
- Vendor Contracts
- Real Estate Development
- Non-relocation Agreements
- Memorandums of Understanding
Representing College Coaches
- All aspects of the negotiation and construction of college coaching contracts, including compensation, termination, contract interpretation, etc.
Representing Student-Athletes
- Investigation of alleged coaching abuse allegations for the student-athlete and presentation of the same to universities and colleges
- NIL contracts - House settlement
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Sports Law Expert Witness
Illustrative cases Mr. Greenberg provided authoritative testimony:
Real State Law
- Provided expert analysis on landowners’ rights and common area use in Lake Beulah Property Management v. Cook.
- Evaluated standards of care and professional liability of real estate brokers in Walker v. Eliason Realty.
- Offered opinion on industry practice and licensee obligations in arena agreements in Golden State Warriors, LLC v. Oakland-Alameda County Coliseum Authority.
- Assessed statutory and board standards compliance in real estate condition report disputes.
- Analyzed drafting diligence and liability issues in condominium easement matters.
- Reviewed factual and legal criteria for rescission as a remedy in closed real estate transactions.
- Examined thresholds for adverse possession and prescriptive easements under state law.
- Clarified interpretation of “as is” clauses, title chain complexities, and fiduciary duties in brokerage practices.
- Addressed broker ethical violations and professional responsibilities in wrongful death and high-rise homeowner disputes.
In addition to these, Mr. Greenberg has been repeatedly called upon for matters involving adverse possession, prescriptive and necessity-based easements, and determining whether rescission is an appropriate remedy in closed transactions.
Notable Courtroom Engagements & Consultations:
Sports Law
- Drafting and assessing the enforceability of exit/departure fees when a team exits a league.
- Coaching termination case (Mike Kramer vs. University of Montana–Bozeman): evaluated whether proper procedures were followed and reputation harm was unjustly inflicted.
- Kareem Abdul-Jabbar vs. Agent Tom Collins: examined fiduciary duties and potential regulatory violations in representing athletes
- Baltimore Orioles vs. Maryland Stadium Authority: addressed lease parity issues by comparing benefits granted to other professional franchises.
- NBA coaching contract dispute: analyzed "mitigation of damages" clause and its intended meaning in arbitration.
- Provided consultancy on stadium lease disputes for entities including the San Diego Tribune, Baltimore Orioles, and Nashville Predators.
- MLB team structure and liability in relation to owner exposure and "piercing the corporate veil" scenarios.
- Paterno, et al. vs. NCAA, et al.: served as expert on assistant coach employability issues.
- Bret A. Bielema vs. The Razorback Foundation, et al.: addressed university coach termination, focusing on mitigation concepts.
- College coach buyout clauses: provided benchmarks for industry standards.
- Expert analysis on professional sports leases, including responsibility for facility-related debts.
- Fiduciary standards for agents advising college coaches—especially concerning tax-related financial packages.
