Rishi Garg, the Vice President for Corporate Development and Strategy at Twitter, a role that put him in charge of the Mergers & Acquisition strategy, has announced his departure after a tenure of 13 months.

"After an amazing ride as Twitter's VP Corporate Development and Strategy, I'm saying farewell today," he tweeted yesterday.

"Our team has built a stronger Twitter with a dozen acquisitions in the last year. Hats off to @dickc for admirable leadership, humour, energy, and trust," Garg said, using Costolo's Twitter handle to thank him.

"I can't wait to witness the company's next chapter. I'm off to pursue some exciting new projects; more soon! #staytuned," the tweets read.

Twitter did not immediately announce a replacement for Garg, whose departure comes just two week after Costolo announced he was stepping down as the company's CEO.

Costolo has been replaced by co-founder Jack Dorsey on an interim basis. Other high-level departures over the last 18 months include product chief Daniel Graf, COO Ali Rowghani, and CFO Mike Gupta.

Before joining Twitter, Garg was the M&A chief for fellow Jack Dorsey company Square. According to his online profile, Garg received a BA in Economics and MS in Industrial Engineering from Stanford University, and an MBA from the Harvard Business School.

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