All Thinkers

Thinkers Timeline

Key thinkers across history — grouped by era, colour-coded by discipline. Click any card to explore ideas, quotations, and classroom contexts.

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Modern — 1800 to 1950
Mary Parker Follett 1868-1933 · United States
Mary Parker Follett (1868-1933) was an American political philosopher and management thinker whose ideas about authority, conflict, and organisation anticipated much of the later twentieth century's humanistic approach to management. She was born in Quincy, Massachusetts, to a family of modest means. Her father, a Civil War veteran, died when she was young; her mother became an invalid, and Follett took on significant family responsibilities while still a student. She studied at the Annex — which later became Radcliffe College — at Cambridge University, and in Paris, focusing on history, political economy, and philosophy. Her first major book, The Speaker of the House of Representatives, appeared in 1896 and remains a standard work on the history of that institution. She worked for decades in community organising, founding evening recreation centres and other services in Boston's poorer neighbourhoods and serving on various committees on industrial and social questions. Her experience in community work brought her into contact with real problems of coordinating people with different interests toward common ends, and she drew on this experience to develop her later writings on management and organisation. The New State (1918) and Creative Experience (1924) argued for a democracy based on the integrating of differences rather than on majority rule. In the late 1920s she was invited to lecture to business audiences in the United States and England, and these lectures — posthumously collected as Dynamic Administration — made her reputation as a management thinker. She died in Boston in 1933. Her work was largely forgotten during the mid-twentieth century but has been rediscovered since the 1970s as the fields she influenced caught up with her.
"Power is with, not power over."
Judith Heumann 1947-2023 · United States
Judith Heumann was an American disability rights activist. She is often called 'the mother of the disability rights movement'. She was born on 18 December 1947 in Philadelphia, Pennsylvania. Her parents, Werner and Ilse Heumann, were German Jewish immigrants. Many of their relatives had been killed in the Holocaust. The family later moved to Brooklyn, New York. When Judy was 18 months old, she got polio. This was during a large outbreak of the disease in the United States. A machine helped her breathe for three months. When she recovered, she could not walk. She used a wheelchair for the rest of her life. At age five, the principal of her local school refused to let her attend. He called her a 'fire hazard'. Her mother fought this. Eventually Judy got an education, partly in special classes and partly in a public high school. She went to Long Island University, where she began organising other disabled students. In her twenties, she applied to become a teacher in New York City. The Board of Education passed her written and oral exams but failed her medical exam because she used a wheelchair. In 1970, she sued them. The judge, Constance Baker Motley (the first Black woman federal judge), made it clear the Board would lose. They settled. Heumann became the first wheelchair user to teach in the state of New York. She taught for three years. She became one of the main leaders of the American disability rights movement. In April 1977, she led a 26-day sit-in at a federal building in San Francisco. The sit-in forced the US government to implement Section 504, the first major US disability civil rights law. She later worked for both the Clinton and Obama administrations. She wrote her memoir Being Heumann in 2020. She died on 4 March 2023 in Washington D.C., aged 75. The Americans with Disabilities Act of 1990 and the UN Convention on the Rights of Persons with Disabilities (2006) both owe much to her work.
"Some people say that what I did changed the world. But really, I simply refused to accept what I was told about who I could be. And I was willing to make a fuss about it."