[2][4] Casinader had ambitions to be a lawyer but in 1946, due to a shortage of teachers, the principal of Methodist Central College, S. V. O. Somanader, invited Casinader to be a temporary voluntary teacher at the school.

[1][4] He studied at the Government Teachers' College (GTC) in Maharagama between 1950 and 1951, obtaining a diploma in education.

[2][4][9] He represented Sri Lanka at Amnesty International's world conference in Amsterdam.

[1][2][9] He was president of the Batticaloa Football Association and East Ceylon Travellers’ Federation, co-patron of the Ceylon Referees Association and vice-chairman of the Eastern Transport Board Consultative Committee.

[1][9] He was a member of the Eastern University of Sri Lanka's board of governors.