Having a keen interest in writing since his college days, M. Mohanan was encouraged by actor Sreenivasan to take up script writing professionally, while he was still studying. Before making his debut, he worked on 14 of director Sathyan Anthikad projects as an assistant director. He finally made his directorial debut in 2007 with the Mammootty and Sreenivasan-starrer Malayalam drama Katha Parayumpol.

His other projects include Manikyakkallu, 916, which also marks his debut as a writer, My God, and Aravindante Athidhikal.