Harry and Esther Snyder opened In-N-Out in Baldwin Park, California, in 1948, using a two-way speaker to create what the episode calls California’s first true drive-through hamburger stand. They refused to franchise or take outside investors, and when Harry died in 1976 at 63 the chain had just 18 locations. Son Rich Snyder became president at 24, expanded to 93 restaurants as far as San Diego, Las Vegas and Northern California, and began printing Bible verses on cups and wrappers. In December 1993 he was killed in a plane crash on approach to John Wayne Airport, and his brother Guy took over, growing the chain to 140 locations before dying of a painkiller overdose in 1999.

Esther returned to run the company until her death in 2006 at 86, leaving Guy’s daughter Lynsi, then 23, as the only remaining blood heir. That year vice president and co-trustee Richard Boyd sued, alleging a plot to push Esther out and fire him; the company accused him of construction fraud, suspended him as co-trustee, and after a settlement he was ousted. Former operations chief Mark Taylor served as the first non-family president until Lynsi took the post in 2010. She gained half control at 30 and nearly full control at 35, ruled out franchising and going public, and expanded only where company-owned facilities could supply stores, from Dallas to Colorado Springs to a $125 million hub in Franklin, Tennessee.

• The company owns its distribution chain, including a large facility in Lathrop serving Northern California.
• In 2021 health officials in San Francisco and Contra Costa County shut or restricted stores that would not check vaccination cards.
• In 2023 it barred employees in several states from wearing masks without a medical exemption.
• Hot chocolate, a 1950s item, returned in 2018 as one of the few menu changes in decades.
• Customers waited up to 14 hours in their cars when the first Colorado store opened in 2020.