While the exact reasons for his departure haven't been publicly stated, it's important to note that:
* CBS News is undergoing a restructuring process, with some staff being let go and roles changing. This reorganization could have played a role in Quinn's departure.
* Quinn has been a contributor to CBS News for over 20 years, so it's possible he simply decided to move on to other opportunities.
* Quinn has expressed his gratitude for his time at CBS in his farewell message. He has also stated that he is "excited for what the future holds" and plans to focus on his other interests.
It's likely a combination of factors contributed to Quinn's departure, but ultimately, the exact reason remains unknown to the public.