Walsh assumed his current position in 2020, before which he spent 11 years as CEO of Cabrini Health Australia. JHAH was formed in 2013 by Saudi Aramco and Johns Hopkins Medicine. JHAH signed an MoU with the Royal Commission for Jubail and Yanbu in January 2024, to foster future healthcare collaboration opportunities. In June 2024, it signed an agreement with the Canadian Medical Center Co. to operate nine healthcare clinics for JHAH. Walsh is also a medical doctor with a specialty in medical administration.