William John Mountain was born in Woolwich, England, in 1836. He migrated to Australia and became involved in local government. He served as a South Melbourne Councillor from 1875 to 1885. Re-elected in 1893, he served until his death in 1906. He served as Mayor of South Melbourne twice, including 1902, when a medal was issued by the City to commemorate the coronation of Edward VII (NU 20254).
Photographs of Mountain are held in the Port Melbourne Local History Collection.
City of Port Phillip website http://library.portphillip.vic.gov.au
Another photograph can be viewed on the Mountain family history website (copy in sup file).