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Mary Ann Plankinton

Mary Ann Plankinton brings more than 20 years of experience to Gawthrop Greenwood with her multijurisdictional practice in Pennsylvania and Delaware focusing on family law (including divorce, support, custody and adoption) as well as estate planning and administration and estate litigation matters.

In addition to her regular practice, Mary Ann is a trained mediator and has successfully mediated cases in Pennsylvania and Delaware for family law disputes and estate matters. Representative cases include divorce matters involving family businesses, custody relocation, grandparent rights, will contests, guardianships and challenges to accountings.

Mary Ann is appointed by the Delaware Courts as a Guardian Ad Litem representing children placed in foster care, and she serves as a private Guardian Ad Litem for children when appointed by either the Delaware or Pennsylvania Courts. She is a certified mediator for the Orphans’ Court of Chester County and chaired its Mediation Committee.

A member of the Pennsylvania, Delaware and Chester County Bar Associations, Mary Ann received her law degree from Widener University School of Law and her undergraduate degree from Saint Joseph’s University. She is also a graduate of Ursuline Academy in Wilmington, Delaware. She has been recognized as a Top Lawyer by Main Line Today and Delaware Today.

Mary Ann is a member of the North Captiva Civic Association and is active in the preservation of the island landscape and resident sea turtles. She is also a board member of Hope Springs Equestrian Therapy, which provides affordable therapeutic horseback riding to enhance the quality of life for individuals with cognitive, physical, emotional or behavioral disabilities, and a member of the West Brandywine Township Trails Commission. A member of the Pennsylvania Farm Bureau, she was instrumental in supporting Community Supported Agriculture (CSA) in southern Chester County and continues to support this cause.


  • Supreme Court of Pennsylvania
  • Supreme Court of Delaware
  • Third Circuit Court of Appeals


  • Widener University School of Law
  • Saint Joseph’s University, B.S., Political Administration


  • Orphans’ Court of Chester County, certified mediator
  • Pennsylvania Bar Association
  • Delaware Bar Association
  • Chester County Bar Association
  • North Captiva Sea Turtle Foundation
  • Hope Springs Equestrian Therapy
  • Pennsylvania Farm Bureau
  • West Brandywine Trails Commission


  • Top Lawyers, Main Line Today, 2014, 2016-present
  • Top Lawyers, Delaware Today
  • Top Lawyers, Daily Local News, 2023, Readers Choice Awards
Mary Ann Plankinton

(302) 777-5353 ext.2250



  • Top Lawyers, Main Line Today, 2014, 2016-present
  • Top Lawyers, Delaware Today
  • Top Lawyers, Daily Local News, 2023, Readers Choice Awards

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