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**Julian Lowell Coolidge** (September 28, 1873 – March 5, 1954) was an American mathematician, historian, a professor and chairman of the Harvard University Mathematics Department.^{[1]}

Julian Coolidge | |
---|---|

Born | September 28, 1873 Brookline, Massachusetts, U.S. |

Died | March 5, 1954 Cambridge, Massachusetts, U.S. | (aged 80)

Nationality | American |

Alma mater | Harvard University Oxford University |

Known for | A Treatise on the Circle and the Sphere |

Awards | Legion of Honour – Knight (1919) |

Scientific career | |

Fields | mathematics |

Institutions | Harvard University |

Doctoral advisor | Eduard Study |

Doctoral students | Roger Arthur Johnson |

Born in Brookline, Massachusetts, he graduated from Harvard University^{[1]} and Balliol College, Oxford.^{[2]}

Between 1897 and 1899, Julian Coolidge taught at the Groton School, where one of his students was Franklin D. Roosevelt.^{[1]} He left the private school to accept a teaching position at Harvard and in 1902 was given an assistant professorship, but took two years off to further his education with studies in Turin, Italy^{[1]} before receiving his doctorate from the University of Bonn.^{[1]}^{[3]} Julian Coolidge then returned to teach at Harvard where he remained for his entire academic career, interrupted only by a year at the Sorbonne in Paris as an exchange professor.^{[1]}

During World War I, he served with the U.S. Army's Overseas Expeditionary Force in France, rising to the rank of major. In 1919, he was awarded a Knight of France's Legion of Honor.^{[1]}

Coolidge returned to teach at Harvard where he was awarded a full professorship. In 1927 he was appointed chairman of the Mathematics Department at Harvard,^{[1]} a position he held until his retirement in 1940. A Fellow of the American Academy of Arts and Sciences,^{[4]} Coolidge served as president of the Mathematical Association of America and vice-president of the American Mathematical Society.^{[1]}^{[5]} He authored several books on mathematics and on the history of mathematics.
He was Master of Lowell House (one of Harvard's undergraduate residences) from 1930 to 1940.^{[6]}

Coolidge died in 1954 in Cambridge, Massachusetts, aged 80.^{[1]}

- J. L. Coolidge (1909)
*The elements of non-Euclidean geometry*, Oxford University Press. - J. L. Coolidge (1916)
*A Treatise on the Circle and the Sphere*, Oxford University Press.^{[7]} - J. L. Coolidge (1924)
*The geometry of the complex domain*, The Clarendon Press. - J. L. Coolidge (1925)
*An introduction to mathematical probability*, Oxford University Press. - J. L. Coolidge (1931)
*A Treatise on Algebraic Plane Curves*, Oxford University Press (Dover Publications 2004). - J. L. Coolidge (1940)
*A history of geometrical methods*,^{[8]}Oxford University Press (Dover Publications 2003). - J. L. Coolidge (1945)
*History of the conic sections and quadric surfaces*, The Clarendon Press.^{[9]} - J. L. Coolidge (1949)
*The Mathematics Of Great Amateurs*, Oxford University Press (Dover Publications 1963).

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^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}^{i}^{j}O'Connor, John J.; Robertson, Edmund F. "Julian Coolidge".*MacTutor History of Mathematics archive, University of St Andrews*. Archived from the original on 9 September 2021. Retrieved 9 September 2021. **^**Balliol College Register, 3rd Edition, p491**^**Julian Coolidge at the Mathematics Genealogy Project**^**"The Early History of the American Academy of Arts and Sciences",*Bulletin of the American Academy of Arts and Sciences*,**24**(4): 3–23, 1971, doi:10.2307/3823172, JSTOR 3823172.**^**MAA presidents: Julian Lowell Coolidge**^**https://www.thecrimson.com/article/1954/3/6/first-lowell-housemaster-julian-coolidge-dies/**^**White, H. S. (1919). "Circle and Sphere Geometry".*Bull. Amer. Math. Soc*.**25**(10): 464–467. doi:10.1090/s0002-9904-1919-03230-3.**^**Snyder, Virgil (1941). "Review: J. L. Coolidge,*A History of Geometrical Methods*".*Bull. Amer. Math. Soc*.**47**(1): 20–22. doi:10.1090/s0002-9904-1941-07368-4.**^**Blumenthal, Leonard M. (1947). "Review: J. L. Coolidge,*A history of the conic sections and quadrics*".*Bull. Amer. Math. Soc*.**53**(1, Part 1): 36. doi:10.1090/s0002-9904-1947-08730-9.

- Works by Julian Coolidge at Project Gutenberg
- Works by or about Julian Coolidge at the Internet Archive
- Coolidge: "Origin of Polar Coordinates" (from MacTutor)