I led the interaction and visual design for the Type to Siri feature on all platforms (see Settings | Accessibility | Siri). It launched for iPhone and iPad with iOS 11, and for Apple TV with tvOS 15.
Type to Siri in iOS 11
Do Not Disturb / Focus
I also led behavior and policy design (and contributed to copy and visuals) for Do Not Disturb While Driving.
Do Not Disturb While Driving in iOS 11
As of iOS 15 this feature has been incorporated into Focus: