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Jason Jeffrey Heinen

Business Attorney at Brookfield, WI

4.9   15 reviews
Free consultation
Free consultation
  • State Years
    Wisconsin - WI 12 years
    Minnesota - MN 11 years
  • Licensed for 12 years
    State WI
    Acquired 2011
    Good Standing No misconduct found
  • Licensed for 11 years
    State MN
    Acquired 2012
    Not Authorized - Non-payment of fees No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About Jason

Learn Jason’s areas of practice.

Practice areas

My grandfather’s great grandfather came to Milwaukee in 1867, the same year Jacob Leinenkugel and John Miller started a brewery in Chippewa Falls.  However, instead of being skilled at brewing beer, Grandpa Heinen had a passion for woodworking.  He started a cabinet shop out of his home and ran his small business off Market Street for over 15 years.  Numerous people throughout Wisconsin have a passion for the skills and talents God gave them; they pour their lives into families and businesses they cherish.  My passion is legal counseling and advocating for those brewers, woodworkers, and business owners—not only as hard workers who take pride in what they do, but as fathers, mothers, grandfathers, and grandmothers.  I use my skills and talents to assist clients in navigating our legal system in a way that will help them protect their businesses and see that their family is provided for in the future.  I have helped mall-owners lease to business startups, home builders draft contracts, medical equipment manufacturers purchase the business from their boss, parents draft wills and trusts so their children receive an inheritance, and grandparents manage assets after the loss of a loved one.  Whether it is buying land, selling a business, or executing a last will and testament, I can help.


Client's Choice 2015
Client's Choice

Photos and videos


The Law Offices of Mark S. Knutson, S.C.
14170 West Greenfield Avenue
Brookfield, WI, 53005-7006


4.9 / 5.0
  15 customer reviews
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Client's Choice 2015
Client's Choice
Client's Choice is an Avvo award granted to attorneys with a significant number of client reviews over 4 stars in a given year.
Posted by anonymous | May 13, 2015
Great Lawyer
Jason helped my husband and I on a legal matter and was very helpful. He explained the entire process, was professional and very pleasant to work with. We will be using him in the future for any additional legal needs.
Posted by Carolyn | May 11, 2015
Barn at Trinity Peak
Jason was awesome to work with. Very responsive. I would highly recommend him to my business associates, family and friends. He is very knowledgeable.
Posted by Minh | March 16, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Jason exceeded all expectations. Grateful for his help.
I really enjoyed working with Jason on a rental property I sold back in 2020. He was professional, friendly and took the time and effort to make sure all our questions and requests were answered. His flat-rate fee was very affordable and covered all our needs. If I could give him 6 out of 5 stars I would. Our Situation was somewhat unique: I sold my property to a church. They were a cash buyer and gave us exactly what we wanted. Turnkey deal; but needed a professional to guide us through. Friends and family suggested a real-estate attorney to save on the 6% Sellers Fee. What a great idea! Jason did everything we hoped and more. At one point we even had to deal with the previous owner who missed some paperwork. Jason & Team got him to respond and comply within 2 days. As someone who's owned a few rentals I wish I had known Jason sooner. Would have made my life easier and kept me in the game longer.
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Posted by Don | September 16, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Jason Heinen is great to work with
We met with Jason in July of 2019 to discuss a possible revocable living trust. We wanted it done quickly due to an upcoming international trip, and Jason was excellent in meeting our needs. He was thorough in his explanations using easy to understand terms. He was there for us with quick responses to questions we had and walked us thru the entire process. He followed up with us in the months that followed to be sure we were following up on what we needed to do. Our experience with Jason has been very good and we would use him again when needed.
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Posted by Michael | September 10, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Probate Attorney
When my father passed away, I was completely lost as to how the probate process worked. I did some searching and came across Jason Heinen. After my initial consultation, I absolutely knew I had picked the right person to handle my father's estate. Jason outlined the various probate options in Wisconsin and clearly identified the pros and cons of which option to choose. He helped me by mapping out the process and the expectations for legal fees. I really appreciated his honesty and sincerity. He quarterbacked the entire process and that gave me time to grieve and not worry about probate. He had it handled. During the process, Jason kept me updated and was very prompt with returning my emails or phone calls. Any time there was a fire, Jason quickly put it out and explained to me exactly what was going on. Probate can be very frustrating but Jason had a way of explaining things. In the end, Jason's timeline and expected fees were very accurate. He delivered exactly was he proposed. But most importantly for me, Jason wasn't a robot or a textbook, he was a real person. He laughed with me and at times, he saw me choke up Jason is an all-around good person who is an expert at his craft and I would recommend him to anyone.
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Posted by Mary | September 5, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Help during a stressful time
I’ve never had to deal with the death of a close relative until recently. Although there as a will we had no idea how to move forward. A friend recommended we contact Jason and it was the best advice we got during this extremely stressful time. Jason took his time explaining the probate process and made sure we understood that needed to be done. I felt so comfortable with him that I had him draft my own will. I would recommend Jason to anyone who needs a patient, compassionate and helpful lawyer.
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Posted by Kirk | September 5, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Real estate representation residential condo
Jason represented me on my condo sale as it was sale-by-owner with no real estate brokers. He was transparent and accurate with me on the cost of his legal service. He took his time to explain the sale and contract process in non-legalese. -Responded to all my emails in a timely fashion. He showed up at my closing, delivered on everything he said he would, and was courteous.
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Posted by Jamie | September 4, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Living will
I had a living will done and Jason was very helpful . He answered all my questions and concerns . I would definitely recommend him .
Posted by Deb | December 27, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Jason did a great job on our case!
Posted by Laurie | May 11, 2015
Thoughtful and Thorough Service
We enjoyed working with Jason Heinen on a couple of recent real estate transactions. Besides being a very pleasant and thoughtful person, Jason quickly earned our confidence by his understanding of what we needed and by his humility in searching out the correct information and advice from those more experienced when necessary. We were so well served and would definitely recommend Jason as trustworthy and very thorough in his work!
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Posted by John | March 12, 2015
House purchase/closing
We bought our current home directly from the owners. Jason walked us through the process with knowledge and wisdom. He was always easy to get a hold of and we heard back from him in timely fashion when we sent questions by e-mail. Jason also went the extra mile for us on a couple occasions, coming to meetings outside his normal circle of travel.
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Posted by Julie | February 28, 2015
Various amounts of work and expertise needed
Jason helped guide me through a complex mix of a will/trust, workman's comp and a land partnership. He was very helpful and knowledgeable and always got back to me quickly. I would highly recommend Jason to my friends.
Posted by Joe | February 26, 2015
Excellent Lawyer
I had the opportunity to work with Attorney Heinen and found him to be very knowledgeable and extremely helpful facilitating my transaction. I would highly recommend Jason and feel he is a highly competent attorney with the best interests of his client in mind. He went well out of his way to ensure everything went smoothly for me and was very happy throughout the communication process. If you're considering Attorney Heinen, then you've made a good choice.
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Posted by anonymous | February 20, 2015
Great service
Jason was very helpful in providing me with legal advice on an issue related to my small business. He was friendly and knowledgeable. He was able to review documents for me in a timely manner and give advice while never even charging me for his services. I also really appreciate the fact that he continually tried to look for ways that would actually help me avoid excess legal fees if necessary. I would highly recommend Jason for anyone looking for a bright, competent attorney who really seems to care about his clients' concerns.
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Posted by James | May 11, 2015
Jim Sereno
Jason did a good job for us on a Family Trust matter. This took from January till July of 2014, He was able to get some properties which weren't listed in the original trust, put into the trust and helped with obtaining such properties as well. It was one of his early projects with AUL LAW.
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  • Free Consultation 30 minutes
Payment methods
Cash, Check, Credit Card


AVVO RATING 9.4 (Superb)

Work Experience

  • Attorney
  • Law Offices of Mark S. Knutson, S.C.
  • 2016 - Present
  • Attorney
  • J. Peterman Legal Group, Ltd
  • 2015 - 2016
  • Attorney
  • Aul Law, LLC
  • 2011 - 2015


  • Liberty University School of Law
  • JD - Juris Doctor
  • 2011
  • University of Wisconsin, Madison
  • BA - Bachelor of Arts
  • 2008

Sample of Legal Cases

  • Residential Real Estate Purchase
  • Real Estate Purchased
  • [Client] v. Tenant
  • Judgment in-favor of Client
  • Asset Purchase
  • New Business Owner


  • Friends of Nashotah
  • Board Member
  • 2012 - Present
  • State Bar of Wisconsin
  • Member
  • 2011 - Present
  • Federalist Society
  • Member
  • 2009 - Present
  • Waukesha County Bar Association
  • Member
  • 2013 - 2014
  • Lake Country Fire & Rescue
  • Firefighter/EMT
  • 2013 - 2015
  • Hartland-Lake Country Rotary
  • Member
  • 2013 - 2014
View all associations

Languages Spoken

  • English

Honors and Awards

  • Rising Star
  • Super Lawyers
  • 2018
  • Rising Star
  • Super Lawyers
  • 2017
  • National Appellate Advocacy Competition Regional Champion
  • American Bar Association
  • 2011

Speaking Engagements

  • The Probate Process From Start to Finish
  • The Probate Process
  • 2019
  • Trusts From A to Z
  • Special Needs Trusts (SNTs)
  • 2018
  • Women's Council of Realtors Quarterly Meeting
  • Handling Real Estate after Death
  • 2015
  • Heritage Christian School
  • Basics of Estate Planning
  • 2015
View all speaking engagements

Attorney endorsements

Received (7)
Given (6)
Endorse Jason
Estate planning Attorney | Feb 06
Relationship: Fellow lawyer in community
"Jason is a great asset to his clients with a passion for doing high quality work. I strongly endorse him."
Estate planning Attorney | Mar 19
Relationship: Supervised lawyer
"Jason is very knowledgeable, responsive and easy to work with in Estate Planning, Probate and Real Estate matters. His first priority is to protect his clients' interests. I endorse this lawyer's work."
Estate planning Attorney | May 16
Relationship: Co-worker
"Jason handles all our files where a client is looking to set up a will, trust, power of attorney, or business. He has helped hundreds of clients."
Estate planning Attorney | Feb 25
Relationship: Worked together on matter
"Jason focuses on understanding his clients' estate planning goals and objectives. He then drafts estate plans to help them accomplish their goals and objectives."
Business Attorney | Feb 23
Relationship: Worked together on matter
"Jason is a very engaging and knowledgeable. I have worked with him on a number of matters over the past several years and have remained impressed. I highly recommend him."
Probate Attorney | Feb 19
Relationship: Worked together on matter
"Jason is an excellent attorney. He is both knowledgeable and efficient. I refer cases to him with confidence."
Real estate Attorney | May 30
Relationship: Supervised lawyer
"I endorse this lawyer."
View more endorsements
Estate planning
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