The closest National Rail station is Hackney Central on Mare Street. From there it is a ten minute walk to Cass or you can take the 277 bus and this will bring you just one minute from Cass.
The closest Tube station is Bethnal Green which is on the Central Line. From outside the station you can take the 388 bus to Well street or the 106 or 254 bus to Mare Street. It is then just a few minutes walk along Well Street to Cass. Alternatively you can take the District Line to Mile End and catch the 277 or D6 bus to Sir John Cass Hall.
The following are local bus routes. Sir John Cass Hall is denoted with a blue circle