Sujatha Rangarajan was born in Triplicane, Chennai but spent his childhood in Srirangam near Tiruchirapalli under the care of his paternal grandmother owing to his fathers frequent transfers in his job.He did his schooling in The Higher Secondary School for Boys, Srirangam. He attended St. Joseph's College, Trichy, where he was a friend of Abdul Kalam (who later became the President of India). Sujatha graduated in the 1954 batch with a BSc in Physics (1952 to 1954). Later he studied engineering in Electronics from Madras Institute of Technology. His writing interests were largely inspired by the short stories and serials published in popular Tamil magazines.

Srirangathu Devathaigal (Angels of Srirangam) is a series of short stories based on incidents in Srirangam during 1940s and 50s which appeared in Ananda Vikatan. Sivaji, a minor magazine from Trichy, published a story during his student days. His first short story was published in Kumudam magazine in 1962. His Kolaiyuthir Kalam was an exciting ghost-themed novel. Penning with his wife's name, Sujatha Tamil literary career spanned more than four decades. An engineer by profession, he was proficient in the language of technology. Widely read and knowledgeable, he presented his knowledge in simple Tamil.
His works stood out during a time when Tamil writing was dominated by social/family dramas and historical novels. His identification with the masses, and his uncanny adoption of their way of talking, behavior, mindset and slang, helped make him popular across multiple demographic segments.
His popularization of technology was one of his greatest contributions and also starting with his Silicon Chip writing in Dinamani Kadhir and Yen, Yedharku, Eppadi in Junior Vikatan. At one point, his writings were appearing in numerous Tamil weeklies and journals simultaneously, including Ananda Vikatan, Kumudam, Kungumam, Kalki and Dhinamani Kadhir. Later he contributed as script/screenplay author for several Tamil movies. His notable movies included Vikram,Thiruda Thiruda, Boys and Sivaji. Most of his early novels/stories were made as movies, including Priya, Gaytri, Karaiyellam Senbagapoo and Anandha Thandavam, among others. Brought up in Srirangam, Trichy, and having spent most of the later part of life in Bangalore, he described both places vividly in his various writings. Among his popular novels are Pirivom Sandhipom (not related to the movie of the same name), Rathham Ore Niram, and Kolaiyudhir Kaalam.

He also immortalized Ganesh-Vasanth and an imaginary advocate pair serving as the main characters in most of his detective stories. Ganesh is a level-headed, senior advocate and Vasanth is his flirtatious junior advocate. The Ganesh-Vasanth pair was based on James Hadley Chase's characters, Vic Malloy and his sidekick.
In his later days, he restricted his writing to essays such as Katradhum-Petradhum. He began to spend more time reading, especially old rare Tamil literature and writings on the latest developments in information technology and computing.

1. Aaah was a novel based on hallucinations, which was published in Ananda Vikatan every week. Its each of the episode starts with the exclaimation phrase "Aaah" and ends with "Aaah".
2. Pirivom Sandhippom 1 - A love story set in Tamiraparani which then travels to New York. Captures a glimpse of an NRI Tamil life in the early 80s. This novel was later made into a film called Ananda Thandavam (film).
3. Pirivom Sandhippom 2
4. Kolayudhir Kaalam - One of the Novel where the famous duo Ganesh and Vasanth appears to solve a supernatural mystery in an Estate House. Detailed descriptions on the Hologram technology, which was a then latest technological trend were included in the story.
5. En Iniya Iyanthira (My Dear Machine) was a science-fiction novel in Tamil involving robots. The novel features Nila, Ravi, Mano, Jeano was a robo dog. The story is written like everything is happening in 2020 A.D.
6. Meendum Jeeno (Jeeno again) was a sequel to En Iniya Iyandhira
7. Srirangathu Dhevadhaigal (Angels of Srirangam) - a series of short stories featuring Sujatha experiences as a boy, a youth and a man in Srirangam, depicting incidents when he was staying in his grandmother house in Srirangam.
8. Karaiyellam Shenbagapoo - A mystery novel in which the male leading character travels to a village for his research on rural songs, and encounters mysterious incidents around him.
9. Nylon Kayiru (Nylon Rope)
10. Nillungal Raajaave was a science fiction masterpiece. Recent Tamil movie Maayavan is very similar to this plot.