Born on: 25 June 1925 at Vellar near Kovalam in Thiruvananthapuram Distrist.
School: Pachalloor L.P.School, Venganor English Middle School and Thiruvananthapuram S.M.V School
College:Nagarcoil Scot Christian College, Thiruvananthapuram Arts College and University College.
Degree in History and Economics.
While, studying in Thiruvananthapuram, joined with the Quit India Movement. It was the beginning of his political career.
When the Students Congress was formed in 1940s, he has undertaken the task to organize its Thiruvthamcore unit.
In 1945, he was elected to the executive of the Travancore University Union.
In 1949, became a member of Indian Socialist Party.
In 1950, became a member of the Trivandrum District Committee of Indian Socialist Party.
In 1956, became the State Joint Secretary of Praja Socialist Party.
In 1964, became the State General Secretary of Praja Socialist Party.
In 1971, became the State Chairman of Socialist Party.
P. Viswambharan has elected as the first Convener of the Left Democratic Front (LDF) which was formed in 1973.
In the period of 1975-77 he has actively worked against the Emergency that declared by the then prime minister Indira Gandhi.
After 1977, he served the Janatha Party and Janatha dal party as it’s State President and National executive member.
As a Legislature
In 1954, he was elected to the Thiruvithamcore-Cochin Assembly from Nemom constituency in Thiruvananthapuram District.
Again in 1960, he was elected to the Kerala Assembly from Nemom constituency.
In1967 he was elected from the Thiruvananthapuram Parliament constituency to the Indian Parliament.
As a journalist
From 1946 to 1958 he worked as a journalist for the Malayalam dailies like Malayali, Mathrubhumi, Swathrathanthakahalam and Desabandhu.
Trade Union Field
He organized and lead the Dakshina Thiruvithamkoor Karinkal Thozhilali Union, Dakshina Thiruvithamkoor Motor Thozhilali Union, Thiruvananthapuram Port Workers Union, Travancore Textile Workers Union, Kerala PWD work establishment Employees Union, Elsctricity board Ministerial Officers Union and so on.
Right from the beginning of the formation of the Coir Co-operative Movement in Thiru- Cochi State (in 1950) he associated it as an active leadr and organizer.
He was the president for over 45 years in the Thiruvallam Pachalloor Coir Vyavasaya Sahakarana Samkham.
Worked as the president of Alappuzha Central Marketing Coir Cooperative Society.
Worked as the vice president of Kerala Coir Marketing Federation for a long time.
Associated as the executive committee member of the National Federation of Industrial CO-operatives for twenty years.