Siena is an Archdiocesan College administered by Brisbane Catholic Education on behalf of the Archdiocese of Brisbane.  The Archdiocese is both the canonical and civil owner of the school site which was purchased with funds allocated for educational purposes.

The Principal is appointed by the Executive Director of Brisbane Catholic Education and is employed on a contractual basis to manage and administer the College under broad policy guidelines issued by the Director of Brisbane Catholic Education and the Siena Schools’ Board.

The Executive Director makes policies concerned generally with the educational administration of the school, eg. enrolment, hiring of staff, class size, termination of enrolment, discipline and curriculum direction.  The Executive Director authorises the Principal to employ staff.

The Principal oversees the finances of the College and works in consultation with Brisbane Catholic Education and the Siena Schools’ Board in decisions regarding capital works and school fees.

Siena staff are employed by the Corporation of the Trustees of the Roman Catholic Archdiocese of Brisbane on both full-time teaching and part-time/contract agreements.  The College has entered into a portability agreement with other Diocesan systems and some Religious Institute schools for retirement and superannuation schemes.