Gregory S. Costabile


Greg balances compassion and advocacy in bringing about amicable resolutions to family law matters.

Greg is a Certified Specialist in Family Relations Law and focuses much of his practice on family law and divorce matters. He is a seasoned litigator and trained in alternative dispute resolution techniques such as Mediation and Collaborative Law and Interdisciplinary Collaborative Law.  As a trusted advisor and strong advocate in this area, Greg has assisted many clients in protection of assets and preservation of family.

Having served in public official capacities, Greg also has substantial municipal law experience and handles matters involving planning and zoning issues, building department citations, point of sale inspections and administrative appeal issues.


  • Certified Specialist in Family Relations Law – Ohio State Bar Association Specialty Board
  • Trained Collaborative and Interdisciplinary Collaborative Law Techniques
  • Trained Guardian ad Litem
  • Trained Mediator

Distinctions + Awards

  • Ohio Super Lawyers – Family Law
  • Chamber Bright Star Award – Mayfield Heights Chamber of Commerce (2019 Honoree)
  • Leadership Cleveland – Class of 2011
  • Most Influential Person in Mayfield Heights – Sun Newspaper
  • Cleveland Clinic Foundation Community Service Award – Honoree
  • Mayfield High School Hall of Fame – 2008 Inductee

Civic Involvement

  • Effective Leadership Academy – Board of Directors
  • Center for Principled Family Advocacy – Board of Directors and Former President
  • Mayfield Area Chamber of Commerce – Board of Directors and Former President
  • Mayfield Business Education Community Alliance Foundation – Former Trustee
  • Mayfield City Schools – Former Member Superintendent’s Advisory Council on Innovative Education
  • St. Francis of Assisi School – Former Member, Advisory Committee
  • City of Mayfield Heights – Former Mayor/Safety Director; Councilman; Council President
  • City of Mayfield Heights/Cuyahoga County Juvenile Court – Former Magistrate for Juvenile Diversion Program
  • City of North Royalton – Former Assistant to the Law Director
  • Cuyahoga County Mayors and Managers Association – Former Trustee; Executive Committee Member
  • Northeast Ohio League for Leadership and Advocacy – Former Member
  • Northeast Ohio Mayors and Managers Association – Former Member; Former Trustee
  • WEWS Channel 5 News – Former Political Analyst
  • Schnurmann House – Former Trustee
  • Knights of Columbus

Professional Affiliations

  • American Bar Association – Former Member – Family Law Division
  • Ohio State Bar Association – Family Law Section, Legislative Drafting Committee, Legislative Review Committee
  • Cleveland Metropolitan Bar Association – Former Member – Family Law Section
  • Justinian Forum

Related Practices

  • Domestic Relations
  • Individual + Family Law
  • Estates, Trusts + Probate
  • Alternative Dispute Resolution
  • Commercial + Business Litigation
  • Public Sector + Municipal Law


  • Cleveland State University College of Law, J.D.

  • Bowling Green State University, B.S.B.A. cum laude


  • Ohio

  • U.S. District Court – Northern District of Ohio

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