On Thursday, December 28, 2017, DAVID FIRESTONE, Ph.D., of Silver Spring, MD. Beloved husband of 71-1/2 years of Bertha "Berdie" Firestone. Devoted father of Richard (Cai-Yen) and Michael (Lisa) Firestone and Janice (Michael) Grillo. Dear brother of the late Bernard (surviving wife, Dell) Feierstein. Loving grandfather of Mei (Adam) Perino, Joshua (Halley), Jilian, Zachary and Adam Firestone and Gregory and Kevin (Erica) Letow. Cherished great-grandfather of Juliana. Dr. Firestone was president of several important scientific societies including American Oil Chemist Society, Association of Official Agricultural Chemists and International Union of Pure and Applied Chemistry. Funeral services were held on Friday, December 29, 2017, at Judean Memorial Gardens Chapel, Olney, MD. Interment followed. Shiva will be observed at the home of Janice and Michael Grillo on Sunday at 4 p.m. with service at 6 p.m. Memorial contributions may be made to the Jewish Social Service Agency Hospice or to the charity of your choice.