Hanmer MS&L founder and MD Sunil Gautam becomes chairman of the agency, which was acquired by MS&L in 2007.
Shergill, also a founding member of Hanmer MS&L, was most recently partner and head of the PR, digital and events division. In his new role, he is charged with expanding the firm's specialty comms services across social media marketing, financial and investor relations, crisis comms and employee comms.
'Jaideep is one of, if not the most, dynamic individuals in the Indian PR and marketing scene today,' said Gautam in a statement. 'As anyone who works with him will know, his relentless drive and insight into India's complex communications environment is an inspiration to us all.'
Hanmer & Partners was founded in 1999 and now counts an offering across eight cities in the country.