Ryan S. MacGillis


Phone: (414) 727-5150
Fax: (414) 727-5155

Ryan is a partner and trial attorney at MacGillis Wiemer, LLC. He focuses his practice on Family Law, Civil Litigation, and municipal cases.  He is licensed to practice law in all Wisconsin county circuit courts, the Wisconsin Court of Appeals, the Supreme Court of Wisconsin, the Eastern and Western Districts of Wisconsin, and the 7th Circuit Court of Appeals.

Ryan has represented numerous individuals in family law cases, including paternity, divorce, child support, property division, and post-judgment actions, throughout south, east and central Wisconsin.

Ryan also works as a Guardian ad Litem in the Milwaukee and Waukesha Counties to represent the best interests of minor children. Ryan’s work as a Guardian ad Litem provides him with a unique perspective in handling family law cases.  His expertise led him to be a presenter at the 2019 Guardian ad Litem training sponsored by the Wisconsin State Bar allowing him to share his knowledge with other family law practitioners.

Beyond his work at MacGillis Wiemer, LLC, Ryan is also an experienced public sector law practitioner.  In his capacity as a Judge Advocate General (JAG) in the U.S. Army Reserve, Ryan has advised many military and federal civilian leaders. He has been in the Army since 2003 and has achieved the rank of Major.  In 2021 he completed a yearlong mobilization to active duty with the famed 10th Mountain Light Infantry Division where he worked as a Special Victims’ Counsel advocating for the rights and interests of sexual assault victims through the military investigative and criminal processes.  He currently works as a Deputy Team Chief for the 214th Legal Operations Detachment.

For his achievements on behalf of his clients, Super Lawyers has continually named Ryan a Rising Star every year since 2013.  During his free time, he volunteers with several organizations, including the Dry Hootch Volunteer Family Law Clinic.  At Dry Hootch, Ryan provides general legal advice to veterans and their families. His skill and passion for what he does allow him the opportunity to help navigate numerous service members and their families through complex issues surrounding military divorces, including military pension and child custody issues.

Ryan is a graduate of the Marquette University Law School and previously received his B.A. in Communications from the University of Wisconsin-Milwaukee. While in law school, Ryan was a judicial intern with the Wisconsin Court of Appeals.

As a life-long resident of Wisconsin, he enjoys fishing, hunting, and hiking with his wife, Leah, daughters, Annabelle and Naomi, and son, Jack. Ryan and his family also enjoy traveling and he has visited several countries in Africa, South and Central America, and Asia. While in Africa, he taught English and Math to 4th-grade students in a rural village.