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About me

I am an active alumnis of the University of Florida.  I currently am a member of the University's Atlanta Regional Council and serve on the Department of Political Science Alumni Advisory Board.  Of course, I am also an avid Gator football and basketball fan.


I am married with two daughters and have lived in Sandy Springs, Georgia for over 20 years.   My hobbies are league tennis and gardening.  I am a mediocre tennis player, but nonetheless play both doubles and singles all four seasons of the year. 


Practice areas


  1. Franchising: 65%
  2. Corporate & Incorporation: 20%
  3. Health Care: 5%
  4. Financial Markets and Services: 5%
  5. Commercial: 5%



Free consultation (30 minutes)

Payment types:

Check, Credit card

Attorney endorsements

4 total 

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  • Auden Lewis Grumet

    I originally met Mike over a decade ago, just a few years after I began practicing law, when we were co-counsel in a convoluted and protracted copyright case. It was a pleasure working with him, particularly as a young attorney in an otherwise very contentious case, and I have looked to him as a mentor ever since. He has provided solid guidance on a number of unusual issues over the years, and he is extremely knowledgeable about franchise law in particular. He is also very patient and has an unusually calm demeanor - but he is by no means timid. In short, I endorse and recommend him without reservation for any potential client who seeks assistance with franchise matters or any number of other commercial/business practice areas.


    Auden Grumet Debt Settlement Attorney
    Relationship: Worked together on matter

  • Philip J. Scolieri

    I met Michael at a lawyers conference. Both of us being business lawyers, I was impressed by Michael's extensive knowledge in the field and would highly recommend clients in his locale to him for their business needs.


    Philip Scolieri Business Attorney
    Relationship: Other

Contact info

Wagner, Johnston & Rosenthal, P.C.

5855 Sandy Springs Circle Suite 300
Atlanta, GA, 30328


GAActive Member in Good Standing 198011/07/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Work experience
TitleCompany nameDuration
ShareholderWagner, Johnston & Rosenthal, PC1996 - Present
Managing PartnerWeinstein, Rosenthal & Tobin1986 - 1996
Attorney at LawLaw Office of Michael S. Rosenthal1984 - 1986
Special Projects CoordinatorGovernor's Offfice of Consumer Affairs (now Office of Consumer Protection)1984 - 1985
Assistant Attorney GeneralGeorgia Attorney General's Office1980 - 1984
Association namePosition nameDuration
State Bar of Georgia, Franchise and Distribution Law SectionMember2010 - Present
Professional Resource GroupFounding Member and Treasurer2007 - Present
Sandy Springs Bar AssociationMember2004 - Present
University of Florida Atlanta Regional Alumni CouncilMember2003 - Present
Atlanta Bar AssociationMember1985 - Present
School nameMajorDegreeGraduated
University of Florida, Fredric G. Levin College of LawLawJD - Juris Doctor1980
University of FloridaN/ABA - Bachelor of Arts1977