Sean Michael Sweeney

Halling & Cayo
Contact: (414) 271-3400
Law School: Marquette University Law School - Marquette University
Jurisdictions: Wisconsin
Federal Circuit


About Sean Michael Sweeney
Sean's practice focuses on business transactional law, business litigation, civil litigation, and real estate law. Sean has experience litigating business and civil disputes as both plaintiff's and defendant's counsel, helping buyers and sellers complete real estate transactions, as well as experience drafting contracts ranging from small business contracts to plow a parking lot to large corporation contracts dealing with operating and maintaining real estate.

Sean earned his Juris Doctor (JD) and Masters of Business Administration (MBA) from Marquette University. He earned his Bachelor of Science degree in Business Economics from Northern Arizona University. Before joining Halling & Cayo, Sean ran his own practice, Tosa Law Office.

Sean has not only the legal training and experience needed to provide complete service, he also has the education and training to understand the real world needs and challenges that organizations large and small face today.

Main Office:
320 East Buffalo St.
Suite 700
Milwaukee, WI 53202
Phone: 414-271-3400

Waukesha Office:
20720 Watertown Rd.
Suite 202
Waukesha, WI 53186
Phone: 262-782-5200
Practice Areas
  • Broker Fraud
  • Business Law
  • Entertainment & Sports
  • Real Estate Law
  • Securities Law
Additional Practice Areas
  • Business Litigation
  • General Civil
  • Free Consultation
    • I am always willing to give a free 15 minute consultations for all cases, and a half hour consultation for most business litigation cases.
Jurisdictions Admitted to Practice
Federal Circuit 
Professional Experience
Attorney, Halling & Cayo
I continue to focus on Wisconsin Business Law, Litigation, Business Formation, and Real Estate law. I have expanded my practice areas to include Securities Arbitration and Sports Law.
Attorney/Owner, Tosa Law Office
Ran my own solo practice focusing on Wisconsin Business Law, Litigation, and Real Estate Law.
Legal Intern, Milwaukee Bucks
Drafted and edited sponsorship deals and employment contracts for the Milwaukee Bucks.
Marquette UniversityM.AMBA in Sports Business
Marquette University Law School - Marquette UniversityJ.DCertificate In Sports Law
Northern Arizona UniversityB.SBusiness Economics
Professional Associations
Member, Wisconsin State Bar # 1063452


Website: Website
Blog: Wisconsin Lawyers Blog



    Halling & Cayo
    320 E. Buffalo St.
    Suite 700
    Milwaukee, WI 53202
    Telephone: (414) 271-3400
    Telephone: (414) 271-3400
    Fax: (414) 386-1722
    Waukesha Office
    20720 Watertown Rd.
    Suite 202
    Waukesha, WI 53186
    Telephone: (262) 782 Ext. 5200