Given the context below, please answer the provided question: 

Context: 
In fact, the first highlight moment of the Chat Assistant occurred twelve years ago at the launch event of the fifth-generation iPhone. Scott Forstall, then Apple's software chief, pressed a button on the iPhone to summon Siri and asked it questions. Inquiring about the weather, searching for restaurants, checking stock prices. Keep in mind that this was a time when smartphones were far from widespread, and being able to check stock prices on a mobile phone was already a very novel thing.

Question: 
Who was the software chief during the first release of Apple Siri?