Michael Freedman
Mathematician and academic
A prominent mathematician, specialized in topology and geometry. Contributed significantly to the understanding of 4-manifolds and was awarded the Fields Medal in 1986 for groundbreaking work in the field. Served as a professor at various institutions and was a leader in mathematical research.
Awarded the Fields Medal in 1986
Contributed to the understanding of 4-manifolds
Other People Born on April 21st
Maurice Wilson
English soldier and mountaineer
Born
April 21st, 1898 128 years ago
Died
1934 92 years ago — 36 years old
Born in 1898, served as a soldier in World War I, later becoming an accomplished pilot. In 1934, aimed to summit Mount Everest, undertaking a solo expedition without supplemental oxygen. The journey was marked by challenges, ultimately resulting in disappearance on the mountain.
Continue ReadingJohn Muir
Environmentalist and author of 'Our National Parks'
Born
April 21st, 1838 188 years ago
Died
December 24th, 1914 111 years ago — 76 years old
Born in Scotland and later moving to the United States, contributions to conservation and environmental activism began in the late 19th century. Established the Sierra Club in 1892, advocating for the preservation of wilderness areas in the United States. Writings included 'The Mountains of California' and 'Our National Parks', emphasizing the importance of natural landscapes. Instrumental in the creation of several national parks, including Yosemite and Sequoia. Efforts significantly influenced public opinion on environmental preservation.
Continue ReadingLicio Gelli
Italian financer of Propaganda Due
Born
April 21st, 1919 107 years ago
Died
2015 11 years ago — 96 years old
A financier associated with a clandestine Masonic lodge, heavily involved in Italian conspiracy and political maneuvering during the Cold War. Established the Propaganda Due (P2) lodge, which gained notoriety for its connections to various political figures, financial institutions, and illegal activities. The activities and influence of P2 were pivotal during a tumultuous period in Italian history, particularly during the 1970s and 1980s. Gelli's role in the lodge included orchestrating efforts that tied together interests across politics, business, and organized crime, causing significant political scandals and controversies in Italy.
Continue ReadingArianne Hartono
Dutch tennis player and Grand Slam contender
Born
April 21st, 1996 30 years ago
Arianne Hartono is a professional tennis player from the Netherlands. Competing in women's singles and doubles, significant achievements include participation in major Grand Slam tournaments. Hartono gained recognition for her performances on the ITF Women's Circuit and the WTA Tour, showcasing a strong playing style and competitive spirit. Throughout the career, key victories in several tournaments highlighted her skill and determination on the court.
Continue ReadingXavi Simons
Dutch footballer and playmaker
Born
April 21st, 2003 23 years ago
Born in 2003, this Dutch footballer emerged as a prominent player in youth academies and later joined Paris Saint-Germain's senior team. The player gained recognition for technical skill and vision on the field. Following a successful stint at PSG, the player transferred to the Dutch club PSV Eindhoven. Contributed to the team by showcasing impressive performances in domestic leagues and European competitions.
Continue ReadingSimon de la Loubère
French mathematician and diplomat
Born
April 21st, 1642 384 years ago
Died
1729 297 years ago — 87 years old
A mathematician, poet, and diplomat, contributions included significant work in mathematics, particularly in the field of combinatorics and number theory. Served as a diplomat in the court of Siam, which involved intricate interactions between cultures. Authored several mathematical texts that combined poetic elements with rigorous mathematical formulations. His time as a diplomat was marked by keen observations of Siamese culture and rituals, documented in writings that provide historical insights into 17th-century Siam.
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