La Trobe University
Dewar became the sixth vice-chancellor of La Trobe University in Melbourne, Australia, in January 2012. On arrival, he declared that his goal was to ensure that La Trobe be "recognised as the natural alternative to Victoria's two Group of Eight universities, with a unique appeal other universities can't offer".
In 2012, Dewar announced a plan to cut 500 subjects and 41 jobs. Dewar fled from student protestors and escaped via a network of tunnels under the university, they being frustrated with his plan to cut university subjects and jobs. In 2014, Dewar announced that 350 staff would be sacked without any voluntary redundancies.
In 2020 as a consequence of the effects of COVID-19 on university revenue, Dewar was one of four vice-chancellors who negotiated with the National Tertiary Education Union's leadership to deliver the Australian Universities Job Protection Framework. La Trobe staff subsequently voted to vary the university's collective agreement pursuant to the Job Protection Framework, opting to take pay cuts to protect the financial equivalent of around 225 jobs.
Humanities and the arts became the subject of reductions in November 2020, with Dewar informing staff that some subjects were no longer financially viable.
In 2021, Dewar consulted on a proposal to close the school of molecular science and reassign its disciplines to other schools in a bid to reduce costs.
In February 2023, La Trobe chancellor the Hon John Brumby announced that, after 12 years, Dewar would conclude his term as vice-chancellor in early 2024.. Dewar is an emeritus professor at La Trobe University.