Mary De Leo- Nester

  • Died: December 27, 2021
  • Location: Berwyn, Pennsylvania

D'Anjolell Memorial Home of Broomall

2811 West Chester Pike
Broomall, PA 19008
Tel. (610) 356-4200

Tribute & Message From The Family

Loving Wife, Mother, Grandmother and Teacher

De Leo- Nester

Mary De Leo Nester age 86, of Berwyn, PA passed away on December 27, 2021

Mary is the daughter of Frank and Mary De Leo and the sister of Dr. Concetta Harakal (all deceased).

Mary graduated from West Catholic Girls High School where she was a pianist in the orchestra. She performed at the Academy of Music with the combined Archdiocesan orchestra under the direction of Dr. Donath a noted composer and director. While in high school, she was on the musical staff as the organist of WFIL, the Philadelphia Catholic Hour. At the same time, she was a substitute church organist at St. Donato's Church and St. Augustine's church.
Mary's teaching career spanned 38 yrs. in several districts with numerous achievements. While at Marple Newtown HS, she established and was a charter member and sponsor of the American Field Service, (a foreign exchange program that flourished).
During the sixties, the Philadelphia Electric Company elected several teachers to attend a conference on the Atom at Argonne Laboratories in Chicago, IL.
Mary was selected and attended.

In 1977, Mary taught at Annapolis Jr. High School where she developed a program to meet the needs of "scientifically-talented" students.
From 1984-2001, Mary taught at Welsh Valley Middle School, Lower Merion H.S., and Bala Cynwyd Middle School. In 1992, she developed the Science Olympiad Team at Bala Cynwyd Middle School.

In 2001, the team competed nationally at the Air Force Academy in Colorado Springs and achieved 4th place in the USA.

In 1995-96 Mary wrote and published activities on the Hazardous Waste for Constitution Works, still in use by the Constitution Education Foundation. This is an interactive program used in classrooms in many parts of the country.

In 1995, Mary applied and was awarded a grant from the National Gardening for Children Association for the development of Bala Cynwyd Middle School Gardening Project. In 2000, she applied and received a Bulb Grant from the National Gardening for Children Association to develop a bulb garden involving the students at
Bala Cynwyd Middle School

In 1998, Mary received an award from Sigma Xi Scientific Research Society of Temple University in recognition of her work in teaching.

After retiring from Lower Merion School District, Mary was a guest teacher in Radnor School District which she thoroughly enjoyed.

A graduate of Temple University where she was Vice President of Delta Sigma Epsilon. Mary continued her graduate work at George Washington University and Cabrini University where she graduated with honors. She is a member of Kappa Gamma Pi, a national Catholic Graduate Honor Society.
Mary was an American Cancer Society volunteer since 1965. She was an avid reader, a lover of music, traveling, cooking, and gardening were her passions!
She was a loving mother, grandmother to Joe and Sam and a faithful friend, She is survived by her husband Harry, son Frank (Jennifer), and two loving grandchildren, Joseph and Samuel.

Relatives and friends are invited to her viewing on Tuesday, January 4, 2022 9:00 AM-10:15 AM with Funeral Mass to follow 10:30 AM (ALL IN CHURCH) St. Norbert Church 50 Leopard Road, Paoli, PA Internment Saints Peter and Paul Cemetery.

In lieu of flowers contributions in Mary's name can be made to the American Association for Cancer Research 615 Chestnut Street, Unit 16, Philadelphia, PA 19106 would be appreciated.

A live stream of the mass will begin promptly at 10:30 AM at


Condolence & Memory Journal

So very sorry to hear of her passing. Mrs. Nester was a remarkable lady, with whom I enjoyed some interesting conversations. I was unaware of her musical abilities on the piano - a trait which she shared with my own Mom. May God bless and keep her, and give strength to her family at this sad time.

Posted by Greg Mactye - Flemington, NJ - Family Friend   January 03, 2022

Mary was a good friend and former neighbor in Amberly. In everything she attempted, she persisted and excelled: her musical talent, her extensive travels, her delicious cuisine and her exquisite gardening. Mary was loved by her many former students, her loyal friends and her adoring family. God rest her soul in His Presense.

Posted by JEAN/JAKE JACOBS - Ocean View, DE - Family Friend   January 01, 2022

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