from such instruments as the Mills Cross. Bolton led the building of a two-element interferometer, composed of two 90-foot antennas. This instrument would go on to incredibly scientifically productive, the test-bed for many leading American radio astronomers, and a prototype for the Very Large Array. One of the first scientific contributions from the Owens Valley telescopes was confirmation of radio emission from Jupiter, which gained significant media and institutional recognition for the instrument. With the successful building of the Owens Valley interferometer, Bolton was promoted to full-professor. He was also awarded a PhD from Caltech, but he refused to use the title throughout his life and referred to it as a "de facto" PhD. The superior resolution of the Owens Valley interferometer meant Bolton and his team were beginning to identify radio sources that still remained unresolved at 10 arcsecond resolution. Following up one of these sources in the optical, 3C295, identified the counterpart as a galaxy at a redshift of 0.46, more than doubling the distance to an object in the Universe. This line of science reasoning set the course for Bolton's career as he returned to Australia. Despite his successes at Caltech, Bolton had an understanding with Bowen that he would return to Australia when a giant radio telescope was being built. Along with poor health caused by the low air quality in Pasadena smog, Bolton and his family decided to return to Australia in 1960. Parkes and quasars Bolton arrived in Parkes, Australia as the development of the new Giant Radio Telescope was underway. Bowen had procured money from the Carnegie Institution for Science, Rockefeller Foundation, and the Australian government to develop a 64 m dish. Bolton had already played an important role in helping assess the design of the telescope, and now took ownership of construction and commission of the Parkes dish. He was also to be the inaugural director of the telescope. The Parkes radio telescope, under guidance of Bolton, was completed on schedule and quickly contributed to two key radio astronomy results. Firstly, the telescope confirmed polarised radio emission from Centuarus A and Vela X. Detection of linear polarisation was confirmation that the radio emission from such sources is produced by the synchrotron mechanism. Secondly, and more importantly, Parkes detected Faraday rotation in polarised radio sources. This was the first astrophysical detection of the phenomenon and a result which was used as conclusive evidence