Mr. Ukwueze Calistus Kelechi who is musically known as Mr. Cal (Mr. Lecturer) is from Obollo-Eke in Udenu Local Government Area,  Enugu State. He is from a family of four (4) children wherein he is the most junior. He studied at Nnamdi Azikiwe University for his BSc in Plant Science. After which he proceeded to University of Ibadan to acquire MSc in Plant Genetics and Molecular Biology.
By career, he is a lecturer in Ebonyi State University, Abakaliki where he teaches Genetics and Molecular biology.
He, by default derives  satisfaction in writing,  composing and making good and classic gospel music of all genre. This has led to his release of an album titled Extreme Worship and many more, soon to come.