Ronald Prussing graduated from the Sydney Conservatorium of Music in 1974. He began his studies as a pianist with trombone as a second instrument, but soon the trombone became his major study. One of his early teachers was Alan Mann, a long-time principal horn of the Sydney Symphony Orchestra. He also studied with Geoffrey Bailey and Baden McCarron, a former Sydney Symphony Orchestra trombonist.
In 1970, having studied the trombone for only 12 months, he was chosen to tour with the Australian Youth Orchestra to Japan for Expo '70. He subsequently gained much experience playing in many orchestras as a casual musician, including the Sydney and Melbourne symphony orchestras.
In 1978 he was appointed Principal Trombone with the Sydney Elizabethan Orchestra (now the Australian Opera and Ballet Orchestra), a position he held for two years, at which time he was appointed Associate Principal Trombone with the Sydney Symphony Orchestra. He was appointed Principal in 1986.
In 1983, he was the first Australian trombonist to be invited to present lectures and give recitals at the annual Seminar of the International Trombone Association, held in Nashville, Tennessee.
Ronald Prussing is a regular recitalist at trombone gatherings in Australia. He is a member of the Salvation Army, and has taken the Salvos' Band on tours of the USA and Canada.