Zenith Anaesthesia was incorporated on 1 February 2019. Its medical director is Dr Tan Leng Zoo.

Dr Tan is an anaesthetist in private practice and a visiting consultant at the Department of Anaesthesia in Khoo Teck Puat Hospital (KTPH), where he was previously a senior consultant.

He has a special interest in airway management and completed a one-year airway fellowship in 2013 at Toronto General Hospital with Professor Richard Cooper. He was the pioneer director of the KTPH Airway Fellowship Programme, which took in its inaugural fellow in August 2015.

He is an adjunct assistant professor at Yong Loo Lin School of Medicine, clinical teacher and core tutor at Lee Kong Chian School of Medicine and the former airway module supervisor for the National Healthcare Group residency programme.

He is the Singapore Society of Anaesthesiologists Airway Special Interest Group immediate past lead.