Presently, Siew Guat Toh holds the position of Group General Counsel at Maxis Bhd.
She is also on the board of Usaha Tegas Sdn. Bhd., Bumi Armada Bhd. and MEASAT Satellite Systems Sdn. Bhd.
In the past she held the position of Group General Counsel at Astro Malaysia Holdings Bhd. and Group General Counsel at UTSB Management Sdn. Bhd.
Ms. Toh received a graduate degree from the University of Malaya and a graduate degree from Harvard Law School.