Roman left for personal reasons and he himself decided to post it as a series of tweets. There was no emergency in his departure and there are folks that have taken over in different roles including @etolstoy as project lead and @mikhail.zarechenskiy as language lead designer. Both of whom have been involved in Kotlin and in the respective areas a number of years.
Many of us thanked him both personally and publicly, as we also did as part of the foundation. Roman will always remain a part of the Kotlin community.
Thank you.