Purkayastha, a 1983 batch IAS officer, is presently serving in his cadre state - West Bengal.
He has appointed to the post, which was lying vacant for nearly four months, in place of T Y Das, an order issued by Department of Personnel and Training (DoPT) said.
Das was sent to her cadre state Assam in May this year.
A total 15 Additional Secretaries and 20 Joint Secretaries have been appointed in various central government ministries in today's reshuffle.
Earlier in the day, Rajiv Mehrishi replaced L C Goyal as Home Secretary.
Goyal has been appointed as Chairman and Managing Director of India Trade Promotion Organisation.
Praveen Sinha, a 1998 batch IPS officer of Gujarat cadre, has been appointed Additional Secretary (Joint Secretary level) in Central Vigilance Commission, it said.
Keshni Anand Arora has been appointed as Additional Secretary (AS), Niti Aayog.
The post has been newly created.
Arun Goyal, a 1985 batch IAS officer, has been appointed as Additional Secretary , Secretariat for Cabinet Committee on Investment in the Cabinet Secretariat.
Ramnganing Muivah, a 1985 batch Manipur cadre IAS officer, has been appointed as Secretary, North Eastern Council, Shillong.
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