Though only 24 years old, Rich Snyder assumed the role of president. By then In-N-Out Burger had grown to 18 drive-thrus, all in Los Angeles County. Harry Snyder oversaw In-N-Out Burger until 1976, when he passed away from cancer. They were expected to work in the restaurants and learn the business from the ground up. The Snyders' two sons, Rich and Guy, began working at In-N-Out Burger at an early age. As Californians became progressively car dependent and fast-food drive-thrus grew in popularity, the Snyders gradually added more outlets, some with double-lane drive-thrus to accommodate more customers. This new outlet was in the San Gabriel Valley east of Los Angeles in the town of Covina. In fact, three years passed before they added a second In-N-Out Burger location. Thus, Harry and Esther Snyder did not rush to open further outlets. It was very important to the Snyders to maintain control of each location in order to continue achieving the high standards they had set as In-N-Out Burger's norm. This business philosophy and the original menu have remained largely unchanged throughout the years. The Snyders' priorities were simple: serve customers high-quality, fresh food with efficient, friendly service in a clean and tidy environment.

The menu was limited to burgers, french fries, soft drinks, and milk shakes. And so Harry Snyder and his wife, Esther, opened what is said to be California's first drive-thru restaurant. This was a rather novel idea, as most hamburger stands of the post-World War II era employed carhops to serve food to customers seated in their cars. Harry Snyder developed the idea of a drive-thru hamburger restaurant where customers would be able to order their food via a two-way speaker unit. In-N-Out Burger started in the Los Angeles suburb of Baldwin Park, California, in 1948. In-N-Out Burger is a private, family-run, nonfranchised company. Known for its made-to-order hamburgers, fresh ingredients, and efficient service, it has maintained the same basic menu and a simple, customer-friendly philosophy since its founding in 1948.

In-N-Out Burger, a California Corporation, is a leading fast-food retail chain with more than 120 locations in California and Nevada.

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