Twinkie's songwriter journey was recently depicted in Lifetime TV Biopic 'The Clark Sisters: First Ladies of Gospel'.
Chan joins Twitch's Head of Music Mike Olson, to expand the company's music division.
The app has over 36m subscribers and promotes mostly African artists.
The deal gives Downtown the rights to over 700 compositions, including songs by One Direction, Sam Smith and Madonna.
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The label is now worth over $300m, with Swift's masters accounting for 35% of the company's market share.
"Vikram’s experience as a global industry leader made him the ideal candidate".
David Cobb, Cece Winans and Ben Vaughn will also serve on Studio Bank advisory board.
