William Grant Sullivan
Obituary

William Grant Sullivan passed away on Thursday, January 22, 2026 surrounded by his loving wife and children. Bill was born on September 21, 1953 in St. Louis, Missouri to Myrtle and Howard Sullivan. He was preceded in death by his parents and sister, Ann.

Bill was a devoted and loving husband to Barbara (née Scott) for 50 years and proud father to William “BG” Sullivan II, Elicia Mouw (John), Amy Sullivan, and Abigail Morgan (Patrick). He was a cherished Papa to Mikaela, Alexis, Paige, Carley, Noah, and Samuel, and Great-Papa to Tilly.

Born and raised in St. Louis, Missouri, Bill moved to Pensacola, Florida shortly after graduating college to accept a position at the Naval Air Station. He and Barbara raised their family there for 20 years before relocating to Yorba Linda, California in 1995 where he entered the private aviation industry.

Bill graduated from Parks College of St. Louis University in 1975 with a degree in Aeronautical Engineering. He devoted his entire professional career to the aerospace industry, a field he loved deeply.

A man grounded in his faith, Bill loved sharing his belief with friends and family. He was an ordained deacon within the Southern Baptist church and spent many of his early years working with youth. He had a passion for coaching little league sports even before he had children of his own. He was especially proud to say he had been one of Emmitt Smith's first football coaches. Over the years he transitioned from coaching to being an enthusiastic and supportive sports dad and papa. He enjoyed attending games and competitions, whether for baseball, soccer, taekwondo, volleyball, dance, talent shows, or cheer.

Above all else, Bill treasured time with his family. He loved boating, traveling in his RV, and having everyone over for frequent family barbeques. His love for barbeque was so great that he even became certified to judge competitive barbeque events.

Bill will be remembered above all as a kind, gentle, and deeply caring man. He had a quiet strength, a generous heart, and a steady presence that made his family feel safe, valued, and loved. He gave generously without expecting anything in return and lived his life with humility, integrity, and grace. His faith guided his actions, his family defined his purpose, and his love will live on through all who were blessed to know him. Bill leaves behind a legacy of devotion, compassion, and unwavering love that will be carried forward for generations.