He is a social worker. Prior to social work, he was working in a private news company Zee-News. He conducts a social organization called Kabir and Parivartan. He is also the activist of the Right to Information Act. He runs a non-governmental organization called Kabir, and is also co-founder of a non-government organization called 'Public Cause Research Foundation'.
He is the editor of the Hindi monthly letter 'Apna Panna'. He has been Anna Hazare's key member of the anti-corruption movement. But later when Arvind Kejriwal decided to leave the agitation and come to politics, Manish supported him.