Take Two released this short statement regarding the news
“After an extended break beginning in the spring of 2019, Dan Houser, Vice President, Creative at Rockstar Games, will be leaving the company,” it noted. “Dan Houser’s last day will be March 11, 2020. We are extremely grateful for his contributions. Rockstar Games has built some of the most critically acclaimed and commercially successful game worlds, a global community of passionate fans and an incredibly talented team, which remains focused on current and future projects.”
There was no reason given for the departure. Seeing as he’s been away for nearly a year, perhaps he has something up his sleeve or perhaps he’s just had enough of video games.
Dan Houser has been involved with Rockstar since the 90’s working on Grand Theft Auto: London 1969 Grand Theft Auto III (2001), Grand Theft Auto: Vice City (2002), Grand Theft Auto: San Andreas (2004) as well as both Red Dead Redemption games.