Law Offices of Mark S. Knutson, S.C.

Jason J. Heinen


Estate Planning, Probate, Business, Real Estate & Guardianship


Jason J. Heinen


Estate Planning, Probate, Business, Real Estate & Guardianship

Areas of focus

Jason’s passion is advocating and counseling individuals and business owners in the areas of:

·      Wills and Estate Planning

·      Probate

·      Trust Administration

·      Residential and Commercial Real Estate Transactions

·      Corporate and Business Law

·      Guardianship


He skillfully assists clients in navigating the legal system in a way that will help them protect their businesses and see that their families are provided for in the future.



Jason is admitted to practice in all courts in the State of Wisconsin as well as the U.S. District Courts for the Eastern and Western Districts of Wisconsin.  He is a member of the Wisconsin State Bar and the Waukesha County Bar and is active in the Probate & Estate Planning and the Real Estate sections of the Waukesha County Bar Association. Additionally, he is a member of the National Academy of Elder Law Attorneys and the Wisconsin Chapter of the National Academy of Elder Law Attorneys.



Contact Jason:


Jason J. Heinen is a 2011 graduate of Liberty University School of Law. He graduated magna cum laude, served as Chapter President of the Federalist Society, and held the position of Symposium Editor of the Liberty University Law Review. Prior to law school, he obtained a bachelor’s degree from the University of Wisconsin-Madison.

After admission to the Wisconsin bar, Jason practiced law in Delafield by day and volunteered with Lake Country Fire and Rescue by night. He also, more recently, was a member of the Sherwood Forest Bowman’s Club.

Presently, he is member of Cornerstone Church in Delafield and serves on the board of the Friends of Nashotah.

Jason became an associate attorney with the Law Offices of Mark S. Knutson in 2016 and continues to assist individuals and businesses attain their legal goals.

Jason and his wife, Jean, live in Lisbon with their three children. In his spare time, he enjoys everything outdoors: hunting, fishing, camping, etc.

What our clients say about Jason

"Jason Heinen is awesome to work with. I've worked with Jason for many years in other areas, and I finally consulted him professionally for some long-term legal planning. He was professional, organized, and efficient. Highly recommend!"

Peter W.

""From the moment you walk into the door you will feel cared for. Both the legal and support staff are kind, highly skilled, and excellent listeners. I'm a lawyer and highly recommend Attorney Jason Heinen if you have any estate planning needs. Not only did I use Jason for my personal estate planning, I recommend him to all my clients. My wife and I felt that he cared about our individual needs, that he was never rushed for time, and was always happy to answer our questions. If you have NO idea what an estate plan is, if you need a will, or even what questions to ask about the entire process – just call up and schedule an appointment with Jason. He and this firm are truly good people and great lawyers.""

Nathan D.

"My wife first met with Jason Heinen to review and settle matters concerning her recently deceased mother's financial estate. Then, together, we met to establish a special needs trust for our adult child and then to review some financials matters and to gain his assistance in updating our own living trust. Jason and his staff were conscientious, attentive, very thorough and considerate in their follow-through regarding the complicated details. We highly recommend Jason to anyone considering the complexities of navigating challenging legal matters."

Bob & Kathy M.

"We worked with Jason Heinen to establish a living trust and will. This was something we had put off for too long. He made the process easy and clear. He helped us along the way and has answered trust related questions we have had via phone and email. I would highly recommend Jason to anyone. He is knowledgeable and approachable."

Danny T.

"After years of putting things off and using a patchwork of "in case something happens" we approached Jason and explained our situation. Jason understood what we needed and was very careful to explain all aspects of our estate planning. We had some different wishes that we wanted carried out and Jason was able to accommodate them in our entire estate plan including end of life wishes. We are very pleased with his services and would not hesitate to recommend Jason to anyone seeking estate planning. We are happy that he is available should things change and is always eager to answer any questions we have."

Scott T.

"Jason provided the professional legal help at a time when I needed someone who had patience and compassion along with the probate knowledge. I am grateful for his expertise along with his understanding."

Kay S.

"My wife and I needed to update and correct some outdated some estate planning. Attorney Heinen walked us through every step. He explained everything in terms that we could understand. He gave us the confidence that our family will have few or no legal hurdles to deal with when the time comes. I have recommended Attorney Heinen. I will continue to use Attorney Heinen and the Knutson Law Firm."

Mark W.

"After the passing of my husband Jason made dealing with the probate of the Estate an easier process. He was very up to date with his knowledge of the issues. Jason took his time to make sure I understood each step of the process and kept things moving. He also assisted me in directing me to other things that needed be handled. I will be using him again to do my Will."

Linda D.

"Valuable insight.Great service. I greatly appreciate my relationship with the Law Offices of Mark Knutson and envision working with them well into the future. Jason is knowledgeable, practical, insightful and professional."

John H.

"Like many procrastinators we were so grateful to finally put a plan together for our estate. Jason was very thorough in talking us through our options, offering clarity and thoughtful options for consideration. He kept the ball rolling with good follow up and as a result we have a flexible and effective plan."

Greg B

"We contacted the Law Offices of Mark Knutson for assistance with our estate planning. Their team helped us make informed decisions, and they quickly and seamlessly prepared our documents. We were also provided recommendations for future consideration. They really care about you and your circumstances. Our family has peace of mind thanks to their expertise."

Christine W.