Alphons was born in 1973 in Kaachery near Nadathara, Thrissur, Kerala, India 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. Alphons was the second among their 7 children. 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. Alphons considers Philip, another talented musician from Thrissur, as his mentor and guru. He was the one who diverted Alphons to Western Classical Music and ghazals.
Alphons had professional training in Carnatic music from Shri. Mangad K. Nadesan (A. I. R) and got 7th grade in classical guitar from London Trinity College of Music and 5th Grade in Western Music Theory. He took up music as a profession after he received the Kala Prathibha award by Calicut University for the years 1990 and 1992. 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. They had listeners all over the world and was the only Asian band which got a chance to participate in World Youth Day. From 2000 onwards, he started working as a composer and a sound engineer in Asia-net Radio 657AM, a radio station in Dubai. He worked there even after the release of his first film soundtrack and composed many jingles and title songs as part of his work. Alphons is currently doing a M.A. in Music. He is a permanent judge in the Reality Show Amrita TV Superstar 2. He was a part of A. R. Rahman's JaiHo Concert – The Journey Home.
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 audio release function of Vellithira was held with several film personalities participating in the grand function including composer A. R. Rahman who appreciated Alphons for the good orchestration of the songs. 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.
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. The film as well as the song became a huge success in Kerala, Tamil Nadu and overseas and the composer called his rendition "soulful". Alphons is now a part of the Jai Ho Concert- The Journey Home World Tour by A.R.Rahman.