Hariharan entered the Malayalam film industry in 1965, and has so far directed more than 60 films, many of which were highly successful both commercially and critically. His movies have mostly explored the complexities of social issues and human relationships, set in the backdrop of Kerala's rich cultural heritage. His films such as 'Valarthumrugangal', 'Panchagni, 'Nakhakshathangal', 'Oru Vadakkan Veeragatha', 'Sargam', 'Parinayam' and 'Ennu Swantham Janakikutty' have entered the Indian Panorama of International Film Festival. He has also been honored with a Diploma by the Pyongyan Film Festival of North Korea for 'Oru Vadakkan Veeragatha'. In 1993, 'Sargam' won him the State Award for the Best Director and also National Award for wholesome and popular entertainment. The film also received special honor at the Fukuoka and Swiss film festivals. His following film, 'Parinayam', won the National Award for social issues and took part in about 7 film festivals across the world. 'Ennu Swantham Janakikutty' was the inaugural film at the Korean film festival (2000), and it also took part in the London film festival(2000). Apart from these recognitions he has also won the Filmfare and the prestigious Ramu Kariat Awards for his works on multiple occasions. His latest film, 'Pazhassi Raja', is his most ambitious project yet. It is based on the life of Kerala Varma Pazhassi Raja, the first revolter against the British East India Company. This historical epic, written by one of the most gifted writers of India, 'Jnanapeeth' M.T. Vasudevan Nair and produced by Gokulam Gopalan, will be released on the 15th of August.