John David Grieci, 65, passed away peacefully on May 18, 2026, surrounded by family. Born on June 16, 1960, in Waltham MA (Johnny) carried his warmth, humor and unmistakable spirit throughout a life filled with friendship & humor. He most recently resided in Corona, CA. John was the beloved husband of Wendy Grieci, whose steadfast love, devotion & support over the last 12 years, allowed John to live his happiest, full life.

Together, Wendy & John created a home filled with laughter, music, incredible food and unwavering love. He was a devoted father to Emily Smith & Matthew Grieci and a proud grandfather to Stella & Maddie. He also shared a close & loving bond with Wendy’s daughter, Testen Dolma and her husband, Liukai. John is survived by his siblings, Deborah Ogden of Jefferson ME; Anne & David Hatch of Hudson MA; and Patricia & James Mahoney of Billerica MA, along with many cherished nieces, nephews, extended family members and dear friends. He was predeceased by his parents, Esther & Ronald Grieci, of Waltham MA.

John’s professional life included being Senior Vice President of Customer Advocacy at Seagate Technology. Previous experience; Senior Director of Supply Engineering at EMC Corporation, and as a Development Engineer at Microcom.

John had a deep love for music and could often be found enjoying his favorite songs sitting at the pool side. He was passionate about food and wine, especially Wendy’s cooking and never missed an opportunity to gather around a great meal. An avid fan of the Los Angeles Dodgers, John brought enthusiasm & humor to every game he watched. He was also known for his collection of wild & colorful socks which perfectly reflected his fun-loving personality.

To know John, was to know extreme generosity, kindness, loyalty & optimism. He was a devoted friend to so many and carried an infectious energy that drew people in instantly. His mischievous, crooked smile and signature greeting – a heartfelt (heeeeyyyy) made everyone feel welcomed & appreciated.