Following completion of his doctoral thesis in theoretical particle physics at Oxford University in 1965, Don Melrose changed his research interests to plasma astrophysics. In 1969, after post-doctoral appointments in the UK and the USA, he returned to Australia to the Australian National University. He eventually left to take his current appointment as Professor of Physics (Theoretical) at the University of Sydney in 1979. He made important contributions to the theory of coherent emission processes in astrophysics: plasma emission in solar radio bursts, electron cyclotron maser emission and pulsar radio emission. His current interests include pulsars, quantum plasmas and solar flares.