[1][2][3] Sundarajan is known for his silver jubilee films such as Payanangal Mudivathillai (1982), Vaidehi Kathirunthal (1984), Rajadhi Raja (1989) and Thirumathi Palanisamy (1992).

He has shared screenspace with prominent actors including Rajinikanth, Kamal Haasan, Vijayakanth, Sathyaraj, Ajith Kumar, Vijay and Suriya.

He collaborated with actor Mohan for his maiden directorial venture,Payanangal Mudivathillai and the film became a sleeper hit and ran for over 175 days in the box office.

[6][7] He furthered his collaboration with Mohan through films including Thoongatha Kannindru Ondru (1983), Saranalayam (1983), Naan Paadum Paadal (1984), Kunguma Chimil (1985) and Mella Thirandhathu Kadhavu (1986).

During the 1970s, Balu Anand who hailed from Coimbatore sought assistance by walking into R. Sundarrajan's office with the intention to secure a job for his livelihood.

R. Sundarrajan then collaborated with his long-time assistant director Balu Anand to write screenplay for Balu Anand's debut directorial venture Naane Raja Naane Mandhiri (1985), which starred Captain Vijayakanth in the main lead role.

[13] He also join hands with Vijayakanth for his directorial venture Amman Kovil Kizhakale (1986) and the film also became a box office success.