Scott Forstall (born 1969) is an American software engineer, best known for leading the original software development team for the iPhone and iPad, and Broadway producer, best known for co-producing the Tony award-winning Fun Home and Eclipsed with his wife. Having spent his career first at NeXT and then Apple, he was the senior vice president (SVP) of iOS Software at Apple Inc. from 2007 until October 2012.

Forstall grew up in a middle-class family in Kitsap County, Washington, the second-born of three boys to a registered-nurse mother Jeanne and an engineer father Tom Forstall. His older brother Bruce is also a senior software design engineer, at Microsoft. 

A gifted student for whom skills such as programming "came easily where they were difficult for others", Forstall qualified for advanced-placement science and math class in junior high school, and gained experience programming on Apple IIe computers.

Enrolling at Stanford University, he graduated in 1991 with a degree in symbolic systems. The next year he received his master's degree in computer science, also from Stanford. During his time at Stanford, Forstall was a member of the Phi Kappa Psi fraternity.

Forstall joined Steve Jobs's NeXT in 1992 and stayed when it was purchased by Apple in 1997. Forstall was then placed in charge of designing user interfaces for a reinvigorated Macintosh line. In 2000, Forstall became a leading designer of the Mac's new Aqua user interface, known for its water-themed visual cues such as translucent icons and reflections, making him a rising star in the company. 

He was promoted to SVP in January 2003. During this period, he supervised the creation of the Safari web browser. Don Melton, a senior developer on the Safari team, credited Forstall for being willing to trust the instincts of his team and respecting their ability to develop the browser in secret. 

In 2005, when Jobs began planning the iPhone, he had a choice to either "shrink the Mac, which would be an epic feat of engineering, or enlarge the iPod". Jobs favored the former approach but pitted the Macintosh and the iPod team, led by Forstall and Tony Fadell respectively, against each other in an internal competition. Forstall won that fierce competition to create iOS. 

The decision enabled the success of the iPhone as a platform for third-party developers: using a well-known desktop operating system as its basis allowed the many third-party Mac developers to write software for the iPhone with minimal retraining. Forstall was also responsible for creating a software developer's kit for programmers to build iPhone apps, as well as an App Store within iTunes.

iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware. It is the operating system that powers many of the company's mobile devices, including the iPhone and iPod Touch; it also powered the iPad until the introduction of iPadOS in 2019. It is the world's second-most widely installed mobile operating system, after Android.

According to en.wikipedia