Mark A. Bartels

Mark A. Bartels is a respected attorney and President of One Law Group, S.C., serving businesses and individuals across Northeast Wisconsin. With nearly three decades of legal experience, he provides practical and cost-effective solutions tailored to each client’s goals. His practice focuses on real estate law, business and corporate matters, estate planning, probate administration, municipal law, and creditors’ rights. He works closely with business owners, financial institutions, developers, and families to guide them through complex legal matters with clarity and confidence.

Mark earned his J.D. from Marquette University Law School and his B.S. from the University of Wisconsin-Madison. His education built a strong foundation in legal analysis, strategic planning, and business principles. He has also served as an instructor at Northeast Wisconsin Technical College, teaching courses in Estate Planning, Estate Administration, and Mechanics of Real Estate, helping prepare future legal professionals.

Mark has represented clients in significant real estate acquisitions, commercial leasing, and multi-million-dollar business sales throughout his career. He drafts and negotiates purchase agreements, leases, financing documents, and corporate contracts. He also advises lenders in complex loan transactions and assists businesses with formation, succession planning, and operations. In estate planning, he prepares wills, trusts, powers of attorney, and tax strategies that protect assets and ensure smooth wealth transfer. In probate matters, he guides personal representatives and families through estate administration efficiently and responsibly.

Mark A. Bartels serves as President of One Law Group, S.C., reflecting his commitment to strategic growth and long-term success for both the firm and its clients. His experience, practical insight, and dedication to service make him a trusted legal advisor in Wisconsin.

Law Office Affiliations

• President/Attorney, One Law Group, S.C.
• Member, State Bar of Wisconsin
• Member, Brown County Bar Association

Licensed State

• Wisconsin

Education

• Marquette University Law School
  Juris Doctor (JD)
• University of Wisconsin
  Bachelor of Science

Awards & Badges