Alphons was born to a musically affluent Christian family. His mother was Thankamma and father was Koladi Joseph, a tablist and a singer but by profession, a KSEB sub-engineer. His elder brother, Joemon was a pianist and had composed music for two Malayalam films. His younger brother Paulson was a well known exponent of Sitar and had got first rank in M.A. Hindustani from Dharwad university. He was introduced to music by his father's younger brother K. K. Paul, who was a well known violinist. He is the lead guitarist, vocalist and one among the founders of Rexband, a gospel music band with a few albums to their credit. This band experimented a lot in gospel music by blending Western music with Hindustani and Carnatic. Alphons had sung some songs by his Rexband and some film songs which had music set by him. But in 2010, Alphons got a big break as a singer for singing "Aaromale", a song composed by Academy Award winner A. R. Rahman in the acclaimed soundtrack for the Tamil film Vinnaithaandi Varuvaayaa. Recently he sang a beautiful song "Nee Yeppa pulla Solla ppora" for the movie "Kumki" music by D Imman. Another song called "Engo Oodugindrai" from the movie "Pizza", music by Santhosh Narayanan. Next one was "Yarukkum Thozhanillei" from the movie "Thanka meengal", music by Yuvan Shankar Raja. He has sung the Malayalam portion of the song "Chellena oru mazhai thuli from the movie "Raja Rani" and he himself wrote the malayalam lyrics for that song and music was composed by G V Prakash. Alphons was introduced to director Bhadran, who was looking for a new music director for his movie Vellithira, by Leo Thadevus, a friend of Alphons, who himself later on became a film director. The songs especially "Hridayasakhi" and "Nee Manimukiladakal" won him immediate attention. "Kera Nirakal" from Alphons' next film Jalotsavam was a super hit and won him critical accolades. The next superhit from Alphons came with Amal Neerad directed movie Big B in which the songs "Vida Parayukayano" sung by Shreya Ghoshal and "Muthu Mazhai" got high acclaims. He also composed musics for Common wealth games for Kerala state and for Medical research project Music for the foetus.