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About me


In his 16th year of practicing law with fine law firms over the years, Mr. Koop now works as a solo practitioner. 


Based in Tiffin, Ohio, Martin practices throughout the entire State of Ohio, depending on the nature of the case. 


Martin has successfully represented hundreds of clients facing legal challenges in unique and varied practice areas, including copyright infringement, trade secrets law, farming, real estate disputes, invasion of privacy, complex business litigation, business divorces, medical malpractice, personal injury, divorce, dissolutions, child custody, intra and interstate adoptions, and criminal cases. 


He is an adjunct professor of Business Law at Heidelberg University in Tiffin, Ohio where he has also taught Criminal Law, International Criminal Law and Media Law. 


Martin is also a performing songwriter who serves as the regional co-coordinator for NSAI, the Nashville Songwriters Association International. 


He is also certified by the Ohio Supreme Court to serve as a court-appointed Guardian ad Litem. 






Practice areas


  1. Lawsuits & Disputes: 50%
    18 years
  2. Divorce: 20%
    7 years
  3. Business: 10%
    18 years
  4. Personal Injury: 10%
    18 years
  5. Criminal Defense: 10%
    18 years



Hourly ($150-225/hour), contingent (33-40%), Fixed (sometimes), Retainer (sometimes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

1 total 

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  • Adam Charles Stone

    In a case that was combined complex state and federal claims, I represented the Plaintiff and Attorney Koop represented one of the Defendants. Throughout the years of litigation that the case endured, Attorney Koop's dilligence, professional, dedication to his client, and high regard for his ethical obligations were foremost and always apparent in his representation of his client and his hard work towards resolving the case.


    Adam Stone Criminal defense Attorney
    Relationship: Opposing Counsel on matter

Contact info

Martin D. Koop Attorney at Law

22 Walker St.
Tiffin, OH, 44883-3030


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Work experience
TitleCompany nameDuration
AttorneyMartin D. Koop Attorney at Law2014 - Present
AttorneySupance & Howard Law Offices2002 - Present
Adjunct ProfessorHeidelberg University2007 - 2014
Tiffin City ProsecutorCity of Tiffin2000 - 2002
AttorneyConnelly, Jackson & Collier1999 - 2000
AttorneyWasserman, Bryan, Landry & Honold1998 - 1999
Association namePosition nameDuration
NSAI (Nashville Songwriters Association International)Regional Co-coordinator for NW Ohio2010 - Present
Ohio State Bar AssociationMember1998 - Present
Legal cases
Case nameOutcome
Herbert v. PorterSuccessful
Andrew Dean v. Krash Creative SolutionsConfidential settlement out of court
State v. SmithUpheld on Appeal
See all legal cases 
Publication nameTitleDate
Lorman Education Services publicationDiscovery Skills for Legal Staff in Ohio2006
School nameMajorDegreeGraduated
University of Toledo College of LawLawJD - Juris Doctor1998
University of Toledo College of LawArt HistoryBA - Bachelor of Arts1993
Speaking engagements
Conference nameTitleDate
Tiffin Art Guild SeminarRelevant Law for Local Artists2013
Ohio Continuing EducationDiscovery Skills for Legal Staff in Ohio2005
Ohio CLEDiscovery Skills for Legal Staff in Ohio2005