Skip to main content

John Andrew Horn

also known as John Horn

About me


Attorney John Horn is a shareholder and co-founder of Horn & Johnsen SC.  Mr. Horn earned a doctorate of law in 1991 and is a highly experienced attorney in his 24th year as a member of the Wisconsin Bar. He has assisted hundreds of families in Estate Planning, including business work and real estate law. 


Mr. Horn graduated from the University of Wisconsin Law School in 1991. Thereafter, he served a two-year tenure in the judiciary as court commissioner for the Marathon County, Wisconsin Circuit Court.  He also wrote several prominent judicial opinions under the direction of (now) Supreme Court Justice Ann Walsh Bradley.   Justice Bradley wrote:  “John’s dedication shows.  He meets the challenges with quality.  He has keen insight into developing legal issues.” 


In 1993, Mr. Horn began private practice in Madison, Wisconsin. His Clientele includes many prominent persons and businesses. Mr. Horn has written several major appeals, two of which were ordered by the court to be published, an honor reserved only for cases that are deemed significant in their effects on Wisconsin law. 



Since 1998, Mr. Horn has dedicated his practice to estate planning. This involves, Trust-based planning, Will-based planning, probate, guardianship, and trust administration. Mr. Horn’s experience is broad-based and substantial. His clients range from successful Mom and Pop business owners to multi-millionaires requiring advanced estate planning techniques. His work allows peace of mind to the elder client, and ease to the elder’s family and survivors. Whether the goal is to avoid probate, save estate taxes or navigate an elder law emergency, Mr. Horn has wisdom and experience to help and guide his clients.


Mr. Horn is a frequent speaker at estate planning workshops throughout Southern Wisconsin.  He has also appeared as guest on local radio shows hosted by financial advisors.  Mr. Horn appears quarterly as a featured guest lecturer at the University of Wisconsin Medical school.  He also teaches continuing legal education courses at the State Bar of  Wisconsin.


Mr. Horn enjoys charitable and pro bono work, often working weekends with low-income elders needing legal basics at no charge. 


Mr. Horn participates in back-country and mountain hiking.  He shares his home with a hyperactive German Sheppard Dog. He spoke five languages, but has forgotten all but two.  Above all, he is thankful or his lovely wife and daughter.


Languages spoken: English, Spanish, Thai

Photos and videos

1521602 1428944092

1521602 1428944066

1521602 1428943873

1521602 1428943802

Practice areas


  1. Estate Planning: 75%
    24 years
  2. Business: 20%
    24 years
  3. Real Estate: 5%
    24 years



Fixed (sometimes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

7 total 

Are you an attorney? Endorse this lawyer

  • David S. Kowalski

    I was involved in a complex estate/family matter with John, and found his rapport with clients to be caring and attentive. His legal work was also meticulous, practical, and most of all, clearly accomplished the goal his client wished to achieve. I highly recommend him.


    David Kowalski Divorce & Separation Attorney
    Relationship: Worked together on matter

  • Sarah Anne Zylstra

    I worked with John on a few matters now and have always found him to be knowledgeable and professional. He is proactive and practical.


    Sarah Zylstra Litigation Attorney
    Relationship: Worked together on matter

Contact info

Horn & Johnsen SC

414 Donofrio Drive
Suite 330
Madison, WI, 53719-2846


WIGood Standing199103/01/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Work experience
TitleCompany nameDuration
President & PartnerHorn & Johnsen SC2013 - Present
PresidentHorn Law Firm, S.C.2006 - 2013
Associate AttorneyWyngaard Law Offices, LLC1999 - 2005
Associate AttorneyWyngaard & Wilson1993 - 1999
Judicial Court Commissioner (Magistrate)Marathon County Courts1991 - 1993
Staff AttorneyWisconsin Lottery1991 - 1991
Law ClerkWisconsin Department of Justice1990 - 1991
Law ClerkMcManus and Sieg, S.C.1989 - 1989
Association namePosition nameDuration
Verona Chamber of CommerceMember2013 - Present
RainmakersSecretary2012 - Present
Madison Estate Planning CouncilMember2011 - Present
NAEPCMember2011 - Present
Wisconsin ForumMember2008 - Present
BNI Badger ChapterPast President2007 - Present
WealthCounselMember2006 - Present
Business Law State Bar SectionMember1991 - Present
Probate and Trust Law State Bar SectionsMember1991 - Present
State Bar of WisconsinMember1991 - Present
Legal cases
Case nameOutcome
Sinai Samaritan Medical Center, Inc. VS Morgan McCabeAffirmed trial court ruling that Morgan was responsible for Jean's medical bills.
Eileen M. Kitzerow v. Don Simon, Inc.Reversal of trial court decision
Jack McManus, PR Estate of Dorothy McManus v. Wisconsin Department of RevenueUpheld
See all legal cases 
Publication nameTitleDate
AAII JournalAvoid the Top 10 Mistakes Made with Beneficiary Designations2014
School nameMajorDegreeGraduated
University of Wisconsin Law SchoolLawJD - Juris Doctor1991
University of Wisconsin, MadisonPolitics, Philosophy, and EconomicsBA - Bachelor of Arts1986
Speaking engagements
Conference nameTitleDate
WebcastAvoid the Top 10 Mistakes Made with Beneficiary Designations2015
Ready, Set, RetirementEstate Planning2015
Prepaid Funeral Plans and Medicaid -- What You Need to Know!Funeral Trusts and Medicaid Planning2015