S. Rangarajan, widely recognized by his pseudonym Sujatha, was a highly influential Tamil writer, novelist, and screenwriter who passed away in 2008. Throughout his prolific career, he authored over 100 novels, 250 short stories, and numerous other works spanning science, drama, and poetry. He achieved significant popularity for his accessible writing style, which resonated with a broad audience by incorporating everyday language and relatable themes. Beyond his literary contributions, Rangarajan was also a trained engineer, playing a pivotal role in the development of India's electronic voting machine. His work often bridged the gap between technical subjects and the general public, making complex topics understandable through his engaging narratives. He also contributed significantly to Tamil cinema, writing screenplays and dialogues for many popular films.

Rangarajan's literary output was diverse, encompassing detective fiction featuring his memorable characters Ganesh and Vasanth, science fiction, and social commentary. He was known for his ability to capture the nuances of spoken Tamil, which contributed to his widespread appeal. His early life in Srirangam and later experiences influenced his vivid descriptions of places in his writings. He also dedicated time to studying rare Tamil literature and advancements in information technology in his later years. Rangarajan received several accolades for his contributions to literature, science communication, and cinema, solidifying his legacy as a multifaceted figure in Tamil culture.

Sujatha distinguished himself in Tamil literature through a unique blend of engaging storytelling and accessible explanations of complex subjects. While many contemporary writers focused on social dramas and historical narratives, Sujatha embraced contemporary themes and a conversational tone that mirrored the language of the masses. This approach, coupled with his knack for adopting their mindset and slang, allowed him to connect with readers across various demographics. A significant aspect of his legacy is his role in popularizing science and technology. Through his writings in periodicals like Dinamani Kadhir and Junior Vikatan, he demystified scientific concepts, making them understandable and interesting to the general public. His science-related question-and-answer columns and books served as vital resources for those seeking to learn about technological advancements and scientific principles.

Beyond his literary achievements, S. Rangarajan was a skilled Electronics Engineer with a forward-thinking mindset. During his tenure at Bharat Electronics Limited (BEL), he was instrumental in supervising the design and production of the Electronic Voting Machine (EVM), a technology now integral to elections across India. His engineering expertise extended to pioneering early developments in word processing, predating the widespread use of personal computers. Rangarajan also played a crucial role in enriching the Tamil language's technical vocabulary by coining new terms for computer-related concepts such as 'password,' 'file,' and 'directory.' These neologisms were widely adopted by software companies, facilitating the localization of technology for Tamil speakers and demonstrating his commitment to bridging the digital divide.

Sujatha's influence extended significantly into the realm of Tamil cinema, where he translated his narrative prowess into successful screenplays and dialogues. He contributed to a number of notable films, collaborating with prominent directors like Mani Ratnam and Shankar. His early film adaptations, such as 'Priya' and 'Gayatri,' showcased his ability to bring his literary characters and stories to the big screen. His contributions to films like 'Vikram,' 'Thiruda Thiruda,' 'Boys,' and 'Sivaji' cemented his reputation as a sought-after screenwriter. He also ventured into film production, co-producing the critically acclaimed biopic 'Bharathi.' His work in cinema demonstrated a consistent ability to craft compelling narratives that resonated with audiences, further solidifying his multifaceted artistic career.