Dr O 'Callaghan is an international expert in the field of information technology.
His significant research contributions have been in machine vision, image processing and computer graphics with applications to computer mapping, remote sensing and geographic information systems.
0 'Callaghan has established the largest Australian R&D group in software technologies providing R&D support for Australian industry in high-performance computing, computer communications, software engineering and multi-media information services.
He has been instrumental in developing alliances with companies in Information Technology industry, including multi-national companies such as Digital, Sun Microsystems and Fujitsu.