Front the Ulisses North America website (2018): "Timothy Brown (Studio Director) is the award-winning designer of Dark Sun and 2300AD, and was Director of Creative Services at TSR supervising the best of the AD&D game worlds, including Ravenloft and Planescape. He is a Brand Manager for Pinnacle Entertainment Group and recently ran his own successful Kickstarter campaign to launch an original new game world, Dragon Kings."
Note: This person is different than Tim W. K. Brown.
From a biography in Imperium Games' Aliens Archive, circa 1996:
Timothy Brown is a long-time designer, editor, and author in the game industry. His career has taken him from Game Designers' Workshop to TSR and finally to starting his own company, Destination Games. At TSR, Tim was the Creative Director for the Ravenloft, Spelljammer, and Dark Sun lines from 1991 to 1993, then Director of Product Development for all products from 1993 to 1995. He is now the head of Destination Games, publisher of Pulp Dungeons adventures and Chaos Progenitus dice game.