The Tata Group on Tuesday announced that Nirmalya Kumar, its Non-Executive Director has resigned from the company from Monday, October 31.The information has been declared in a statutory filing before the BSE on Tuesday by Rajiv Chandan, Tata Chemicals Company secretary.Kumar was also a member of the Group Executive Committee (GEC), formed by ousted Tata Sons Chairman Cyrus P. Mistry, and was dissolved immediately thereafter, on October 24.A professor of London Business School, Kumar had joined the GEC in 2013 and was responsible for planning the group strategy.