Gary Adelson is the son of the late American billionaire Sheldon Adelson, founder of the Las Vegas Sands Corporation, from his first marriage to Sandra Windham. Born in 1953, he is one of three sons from that marriage, alongside brothers Mitchell (who died of a drug overdose in 2000 at age 47) and Ronald. Gary pursued a distinct path from the family's gaming, hotel, and resort empire, becoming a physician specializing in addiction treatment. This professional focus aligns closely with that of his stepmother, Miriam Adelson, a psychiatrist and addiction specialist whom Sheldon married in 1991 after divorcing Sandra in 1988, making Gary her stepson within the family business network. His career choice may have been influenced by familial experiences, particularly the loss of his brother Mitchell to substance abuse. Gary has maintained a notably low public profile, distancing himself from his father's high-stakes casino business and political activities (which included substantial Republican Party donations and pro-Israel advocacy). While details of his specific medical practice are not widely documented, his work contributes to healthcare and recovery efforts, potentially intersecting with the Adelson Family Foundation's philanthropy in medical research and addiction recovery. As a member of one of America's wealthiest families, he benefits from the Adelson legacy but has avoided the media scrutiny that often accompanies it. His personal life remains private.