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

Articles + Presentations

  • Corporate Governance and Risk Management (Presenter, Willoughby Western Lake County Chamber of Commerce, May 2020)
  • Governance in the New World of Uncertainty (Presenter, Ohio Land Title Association, May 2020)
  • Coronavirus: More Business “Unusual” (Presenter, March 2020)
  • Lawyers Serving on Non-Profit Boards: Ethical Considerations and Obligations (Presenter, Lake County Bar Association, September 2019)
  • Judicial and Prosecutorial Efficiency in the U.S. (Panelist, Cleveland Council on World Affairs, March 2018)
  • Ohio Insurance Litigation (Contributing Author, LexisNexis Practice Guide, December 2017)
  • Coalition Building for NGOs (Panelist, Cleveland Council on World Affairs, December 2017)
  • Managing Risk: Tools for Building an Effective Risk & Crisis Management Program (Presenter, Cleveland Metropolitan Bar Association, June 2017)
  • Commercial Transactions Contract Clauses: Equitable Remedies in Ohio (Contributing Author, Practical Law, October 2016)
  • Corporate Political Activity: Are You and Your Company – Or Your Clients – RNC Ready? Parts I and II (Program Chair/Moderator, Cleveland Metropolitan Bar Association, June 2016)
  • True Reagan: What Made Him Great and Why It Matters, A presentation by James Rosebush (Program Chair, Cleveland Metropolitan Bar Association, June 2016)
  • Cybersecurity: Breach Response (Presenter, Lake County Bar Association, July 2015)
  • Financing Options: Well, You Do Have Alternatives! (Co-Author, Properties Magazine, March 2015)
  • Cybersecurity: Investigation-Prosecution-Prevention (Presenter, Cleveland Metropolitan Bar Association, December 2014)
  • Information Governance: What Every D&O Needs to Know (Author, Crain’s Cleveland Business, November 2014)
  • Corporate Responsibility: Data Privacy and Protection (Author, Properties Magazine, November 2014)
  • Cybersecurity Strategies That Every Business, Director, and Officer Needs to Know (Presenter, Mid-Market Business and Technology Conference, July 2014)
  • M&A Strategies: 10 Ways to Enhance Value for the Day you Sell (Presenter, “Profitable Growth…Doing it Better,” The Presidents’ Forum of Cleveland, June 2013)
  • Navigating the D&O Coverage Maze in an Era of Increased Scrutiny (Presenter, Association of Corporate Counsel, Northeast Ohio Chapter, March 2013)
  • Independent Advice is Critical Anytime Internal Roles are Unclear (Author, Counsel to Counsel, 2012)

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
  • Mayfield Business Education Community Alliance Foundation – Trustee
  • Mayfield City Schools – Superintendent’s Advisory Council on Innovative Education
  • St. Francis of Assisi School – 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
  • Political Analyst – WEWS Channel 5 News
  • Schnurmann House – Former Trustee
  • Knights of Columbus

Professional Affiliations

  • The Center for Principled Family Advocacy – President
  • American Bar Association – Family Law Division
  • Ohio State Bar Association – Family Law Section, Legislative Drafting Committee, Legislative Review Committee
  • Cleveland Metropolitan Bar Association – 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 Cleveland-Marshall College of Law, J.D.

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


  • Ohio

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

Want to learn more?