Timothy Ha received his early education in Munsang College and Diocesan Boys' School (DBS).
[2] In 1968, Ha was appointed Principal of St. Paul's College, which is the flagship school of the Anglican Church and oldest educational institution in Hong Kong, and also the alma mater of his father and grandfather.
In 1991, he was appointed a member of the Legislative Council (i.e. legislature of Hong Kong) by the then Governor to serve a four-year term.
Timothy Ha was originally expected to retire as Supervisor and Principal of St. Paul's College in August 2005, after 37 years of service.
[2] However, the Principal-elect abruptly turned down the offer in June 2005 and Ha was expected to continue to serve for at least one more academic year, even after the hosting of a farewell dinner in his honour on July 9, 2005.