Avie Tevanian started at NeXT as chief operating system officer working on the NeXTSTEP operating system for the NeXT cube. He later managed the core operating system group and then all engineering after NeXT left the hardware business and was responsible for NeXTSTEP, OpenStep and WebObjects. He later became senior vice president of software engineering at Apple, helping lead the transition to Mac OS X after Apple acquired NeXT. Currently, he is cofounder and managing director of NextEquity Partners. At Carnegie Mellon before joining NeXT, he was a principal designer and engineer of the Mach operating system upon which NeXTSTEP, and now macOS and iOS, are based.