Former Union finance secretary Hasmukh Adhia, who is credited with successful implementation of the Goods and Services Tax (GST), has been appointed as the chief advisor to Gujarat Chief Minister Bhupendra Patel, an official said on Tuesday. The government has also appointed SS Rathod, the managing director of Gujarat Metro Rail Corporation Limited and former CMD of Sardar Sarovar Narmada Nigam Limited, as the chief minister's advisor, a government release stated.