Mistry had served as the CEO and vice chairman of HDFC Ltd since 2010.
He has assumed responsibility for overseeing operations.
Formerly senior ECD at Cheil India, Aneesh Jaisinghani led successful Samsung mobile campaigns.
Ummat will report to Iraj Fraz, who heads creative for DDB Tribal.
It is a significant milestone as she joins Nitin Jai Shukla to lead OMTV into a new era of success
