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About me


Stephen J. Mayfield is an attorney at York Howell & Guymon, practicing in the areas of corporate law, asset protection, estate planning, federal tax law, charitable giving and trust and probate administration.  Stephen advises businesses and individuals on various tax issues within the context of corporate transactions, emerging entities, and estate plans. He assists entrepreneurs form limited liability companies and corporations, and he advises medical professionals with practice administration, compliance and restructuring. Stephen represents clients regarding mergers and acquisitions, leases, non-disclosure agreements, non-compete agreements, and purchase agreements.  He also assists companies and individuals with succession planning and preparation of buy-sell agreements.  Stephen has also successfully represented clients before the Internal Revenue Service.  Stephen is licensed in Utah and in Nevada where he practiced for a prominent Las Vegas law firm for five years before returning to Utah in 2013.  He continues to represent Nevada clients and others who seek to utilize Nevada’s favorable asset protection laws and devices.  Stephen currently serves on the Board of Directors for the Food and Care Coalition located in Provo, Utah.


Stephen is a graduate of the University of Utah and the Chicago-Kent College of Law (Illinois Institute of Technology).  He earned his LLM in Taxation from Denver University.  Stephen lives in American Fork, Utah with his wife and three children where his son Neil is currently a member of the nationally recognized American Fork High School Marching Band.  Stephen speaks Japanese having lived in Japan for three years, including one year studying on scholarship at the University of Shinshu in Nanago, Japan.  He is also an avid cyclist and skier.



Languages spoken: Japanese, English

Practice areas


  1. Guardianship: 25%
    11 years
  2. Tax: 25%
    11 years
  3. Probate: 25%
    11 years
  4. Estate Planning: 25%
    11 years

Attorney endorsements

1 total 

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  • Michael Leo Potter

    Steven is a proven professional whose focus in the fields of Asset Protection & Estate Planning makes it a pleasure to share membership in the Nevada Forum of WealthCounsel. He is a dedicated and focused attorney whose professionalism, insight and professional skill set make in a valuable advisor for any client seeking top-level representation. Steve is a credit to the legal profession and I am pleased to give him my highest Peer Endorsement.


    Michael Potter Estate planning Attorney
    Relationship: Fellow lawyer in community

Contact info

York Howell & Guymon

6405 S. 3000 E.
Suite 150
Salt Lake City, UT, 84121


We have not found any instances of professional misconduct for this lawyer.
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Work experience
TitleCompany nameDuration
AttorneyYork Howell & Guymon2015 - Present
School nameMajorDegreeGraduated
University of Denver Sturm College of LawTaxationLL.M - Master of Laws2005
Chicago-Kent College of Law Illinois Institute of TechnologyN/AN/AN/A