McGregor-Smith was the former CEO of Mitie Group PLC, a UK facilities management business, from 2007 to 2016.
She was nominated as a Conservative life peer in August 2015.McGregor-Smith joined Mitie as group financial director in 2002 and was promoted to CEO in 2007.
She was the only Asian female chief executive of a FTSE 250 company at this time.
She was awarded a CBE in 2012 for services to business and promoting diversity.
During the decade she spent at Mitie, the firm increased its turnover by £1.5bn billion, which passed the £2bn mark for the first time in 2012.
Upon her appointment to the House of Lords in 2015, after eight years as Chief Executive, McGregor-Smith asked the Mitie board to begin the process of looking for a replacement as Chief Executive.
In October 2016 a handover period with new CEO Phil Bentley began, ending in December 2016.