Early graduation photograph of T.K. Radha — Image courtesy: The Institute for Advanced Study, University of Madras / Presidency College, Madras & Mathrubhumi Archives.

Preface

Preface

Every civilisation reserves its heroes in marble, yet its quiet geniuses often fade into dust. This essay is the rediscovery — a careful unspooling — of Thayyoor K. Radha, born 1938 in Kerala: a woman who studied under the glow of hurricane lamps, earned a gold medal when Indian women were scarcely seen in laboratories, and later conversed with J. Robert Oppenheimer in the precincts of Princeton. Every line here balances history with reverence.

I. The Dawn Beneath Colonial Shadows

Radha was born in Thayyoor, Kerala, in 1938 — an era of kerosene lamps, schoolteachers who doubled as community historians, and colonial syllabi. Her father had once studied at Presidency College, Madras; she followed that same path. Neighbours remember a girl who solved mathematical puzzles faster than the local schoolmaster. Where many daughters of that generation were steered toward domestic arts, Radha quietly steered toward mathematics and physics.

At Presidency College, Madras, she won a Gold Medal in Physics. It was not merely an academic victory: it was a social act. In large lecture halls, surrounded by men, she made visible the possibility that intellect was not a gendered commodity.

II. Under the Tutelage of Visionaries

It was here that Alladi Ramakrishnan — the energetic organiser of theoretical physics in Madras — brought together a small band of students. The course was improvisational: there were no textbooks, only preprints and the patient deciphering of foreign journals that arrived by sea-mail. Radha joined this group and became one of its brightest members.

Within a few years she co-authored fourteen research papers on particle theory and quantum methods, working on topics like Feynman propagators and interactions that would place her work at the frontier of Indian theoretical physics. In classrooms that had not yet learned how to seat women comfortably, she wrote equations that suggested otherwise.

III. The Letter That Bridged Continents

Letter dated 26 November 1965 from Robert J. Oppenheimer inviting T.K. Radha to the Institute for Advanced Study, Princeton — Source: Mathrubhumi.

In June 1965 a cream envelope arrived bearing the crest of the Institute for Advanced Study, Princeton. The letter — signed by Robert J. Oppenheimer — offered her membership for the 1965–66 academic year and travel support. For a young Indian woman, this was a passage into the heart of world science.

“I walked the street where Einstein lived. When I met Oppenheimer, I was struck by his knowledge of the Bhagavad Gita.”

Princeton was then, as it remains, an uncommon conversation: Einstein, Gödel, Dyson, Fubini — the constellation of minds that defined mid-century theoretical physics. Radha joined that conversation as one of the first Indian women and as a representative of a tradition that saw no contradiction between Sanskrit cosmology and quantum enquiry.

IV. Of Love, Latitude and the Long Detour

After the IAS year, Radha returned to India and later travelled on lecture tours to North America. In Edmonton she met Vembu Gourishankar, a professor of electrical engineering. They married; she settled in Canada. An assistant professorship at the University of Alberta was offered, but childbearing and the absence of institutional childcare redirected her path away from a conventional academic track.

In 1973 she enrolled in computing courses and again emerged at the top of her class. The physics department employed her as a scientific programmer, a role in which she translated theoretical formulae into numerical algorithms. For nearly sixteen years she worked behind the scenes — writing simulations, debugging models, mentoring students and researchers.

Later she taught mathematics and coding to schoolchildren, turning private expertise into public benefit: a second career that quietly seeded future generations.

V. The Silence of Recognition

Institutional memory is fragile. Radha's name vanished from many standard references — an erasure produced by migration, a change of name after marriage, and the archival practices of an era that did not prioritise women’s contributions. Only in recent decades did archivists and researchers reconstruct the path: the travel grant records at Princeton, the co-authored papers in Madras, the alumni notes and testimonies.

Her children, who would themselves become scholars — Hari and Hamsa Balakrishnan — now teach at institutions of global repute, continuing a legacy of intellectual curiosity that began in a Kerala village and threaded through Princeton’s quiet corridors.

T.K. Radha in her later years — Image courtesy: Mathrubhumi.

VI. The Circle That Shaped Her — Peers, Mentors, and the Little-Known Pioneers

Long before T.K. Radha drew the attention of Robert Oppenheimer, she was part of an extraordinary yet seldom-remembered circle of young Indian physicists who quietly laid the groundwork for particle physics in India. When she joined Alladi Ramakrishnan’s programme in theoretical physics at the University of Madras, she was joined by a handful of others — including three young women who dared to choose physics when society preferred they chose silence.

Ramakrishnan, newly inspired by his own visit to Princeton, transformed a modest Madras classroom into a nucleus of global exchange. Visiting scientists such as Robert Marshak, Leonard I. Schiff, and Donald Glaser shared their frontier research, while Radha and her peers absorbed, debated, and extended those ideas in real time — often with nothing more than chalk, curiosity, and imported journals that arrived months late by ship.

From this improbable space emerged a cascade of fourteen papers on quantum interactions and Feynman propagators — achievements that testified not only to talent but to collective perseverance. Their classroom was their laboratory; their correspondence with international scholars, their lifeline.

Among those three contemporaries — women of equal brilliance and restraint — were the friends whose paths Radha never forgot. Each would later pursue her own journey through research, family, or teaching, leaving behind traces now being pieced together by historians. Future essays will follow their stories in detail, revealing how this small Madras group quietly anticipated the larger feminist awakenings of science in the decades to come.

“We were never competing with the world,” Radha once recalled. “We were simply trying to learn what the world was learning — and to do it here, in India.”

This circle of learners and teachers reminds us that progress is rarely solitary. It grows, as it did for Radha, from the shared impulse to understand — and to pass understanding forward.

Adapted from archival reflections and interviews in the Institute for Advanced Study’s “Rediscovering One of the Institute’s First Women of Color” and the Grandma Got STEM archive.

Related Reading: Discover the untold story of Radha’s peers in Madras — The Madras Quartet — Radha and Her Circle of Physics .

Epilogue — The Light Beyond Equations

T.K. Radha’s story is not measured by prizes but by persistence. She did not seek monuments; she sought understanding. Her life asks us to enlarge the canon of scientific memory — to include the coders, the teachers, the mothers, and the silent collaborators whose work allows discoveries to stand.

“Now I am become Light, the seeker of truth.”

Between Oppenheimer’s famous invocation of the Gita and Radha’s quieter invocation of inquiry lies the modern scientist’s paradox: to wield knowledge responsibly while remaining humble to the unknown.

Coda — A Footnote to History

In Princeton’s archives a letter dated 26 November 1965 bears her name — a paper thread that connects Kerala to the Ivy league. In Edmonton’s classrooms her lessons linger in notebooks and student recollections. She did not vanish; she settled into the work of building others.

Glossary & Locutions

Presidency College, MadrasOne of South India’s premier colleges; produced many scientists and civil servants.
Alladi RamakrishnanFounder of the Institute of Mathematical Sciences, Madras; a pioneer of theoretical physics education in India.
Feynman PropagatorA function describing the probability amplitude for a particle's transition between two spacetime points.
Institute for Advanced Study (Princeton)A private independent centre for theoretical research where Einstein, Gödel and many others worked.
Bhagavad GitaAncient Indian scripture with philosophical expositions often referenced in modern scientific reflection.

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