William J. Hammett

Attorney William J. Hammett is a founding member and partner with Hammett, Bellin & Oswald, LLC. Established in 1997, the law firm has offices in Neenah and Appleton, Wisconsin. Serving clients throughout the Fox Valley region and surrounding areas, Mr. Hammett represents the rights and interests of those who are going through a divorce or other serious family issue. Attorney Hammett graduated from UW-Madison in 1986. He received his Juris Doctorate from Marquette University in 1989. Mr. Hammett is a member for the Winnebago County Bar Association and served as President in 1997-98. Mr. Hammett is licensed to practice in the State of Wisconsin and the United States District Court for the Eastern District of Wisconsin. Widely regarded as one of the leading family law attorneys in his region, Mr. Hammett has achieved notable success counseling and guiding client through the divorce process assisting in reaching agreements and resolving their conflicts concerning custody, placement, support, spousal maintenance, the division of the marital estate, and other related matters. Approximately 80% of Mr. Hammett's practice consists of representing clients in divorce actions, paternity actions, adoptions, and termination of parental rights proceedings. The remaining 20% of his practice consists of mediating family law disputes to help parties come to terms in the most amicable and efficient manner possible. As noted, Mr. Hammett has significant experience with paternity actions, adoptions and termination of parental rights cases. In all cases, he treats his clients with the compassion and respect they deserve as he works to help increase their chances of obtaining the favorable outcomes they seek for themselves and their children. Recognized for his success, Mr. Hammett holds a Martindale-Hubbell Distinguished Peer Review rating and has earned numerous other accolades from his peers. He also received many five-star reviews and heart-felt testimonials from his satisfied clients as well as 10 Best in client satisfaction award from the American Institute of Family Law Attorneys. His AVOO rating is 10. Awards and Honors Super Lawyers® Selectees William J. Hammett included in a Super Lawyers® list Honors Top 5% Family Law Attorneys in Wisconsin, Wisconsin Super Lawyers, 2008 - 2024 10 Best Family Law Attorneys in Wisconsin, American Institute of Family Law Attorneys, 2014 Other Sources of Feedback About William J. Hammett Included on the 2025Wisconsin Super Lawyers list Past Lists 2024 Wisconsin Super Lawyers list 2023 Wisconsin Super Lawyers list 2022 Wisconsin Super Lawyers list 2021 Wisconsin Super Lawyers list 2020 Wisconsin Super Lawyers list 2019 Wisconsin Super Lawyers list 2018 Wisconsin Super Lawyers list 2017 Wisconsin Super Lawyers list 2016 Wisconsin Super Lawyers list 2015 Wisconsin Super Lawyers list 2014 Wisconsin Super Lawyers list 2013 Wisconsin Super Lawyers list 2012 Wisconsin Super Lawyers list 2011 Wisconsin Super Lawyers list 2010 Wisconsin Super Lawyers list 2009 Wisconsin Super Lawyers list 2008 Wisconsin Super Lawyers list

• Partner
• Attorney

• O'Neil, Cannon & Hollman, SC, Associate, 1989 - 1991

• Wisconsin, 1989
• U.S. District Court Eastern District of Wisconsin, 1989

• Winnebago County Bar Association, 1991 - Present (Member)
• Winnebago County Bar Association President, 1997 - 1998