Stephen Lyle Pentoney Jr., loving son, husband, father, grandfather, passed away on Saturday May 8, 2021. Private funeral services will be held in June at Montecito Memorial Park in Colton, CA. Stephen earned his doctorate degree in analytical chemistry at UC Riverside, followed by a postdoctoral position at Stanford University. He made great contributions working with scientists around the world. He was inducted into the Beckman Coulter Inventors hall of fame in 1997. He held 17+ patents and 30+ publications, including one co-authored publication with his son, Christopher. Stephen had a great love for the Southern California coastline and enjoyed surfing, surf-fishing, and boating. With his Captain’s license he spent many hours with good friends or chartering for offshore sports fishing in Mexican waters. Stephen was a very dedicated father. He spent much of his time coaching his children’s sports teams during their youth. He was influential to their personal and academic lives and careers to follow. Stephen had a keen ear, a kind soul, a wonderful sense of humor, and was a true and loyal friend to many. Stephen is survived by his wife, Terry Pentoney, three children: Christopher, Amber, and Jennifer, and grandchild Niki.