Who invented ChatGPT?

Could you please elaborate on the origins of ChatGPT? I'm particularly interested in understanding who was the visionary mind behind its creation. Was it an individual or a team of experts who collaborated to bring this remarkable AI chatbot into existence? I'm also curious about the motivation and inspiration that led to its development. Could you provide a brief overview of the key milestones and events that led up to the launch of ChatGPT? Thank you for your insights.