Venkatachalam is a Tamil author specializing in devotional literature. His book "ஷீரடி சாய்பாபாவின் 9 வியாழக்கிழமை விரத சிறப்புகள்" (9 Thursday Fasting Highlights of Shirdi Sai Baba) focuses on the significance and observances of the Thursday fasts dedicated to Shirdi Sai Baba.