Nathan Altshiller Court (1881-1968)
geometer

Possibly the most often cited book in the subject of triangle geometry is Nathan Altshiller Court's College Geometry - An Introduction to the Modern Geometry of the Triangle and the Circle (Barnes & Noble, 1952). Nathan Court was born in Warsaw, Poland, and received the D.Sc. degree in 1911 from the University of Ghent, in Belgium. He became an Assistant Professor of Mathematics at the University of Oklahoma in 1917. In 1919, he became a U.S. citizen and changed his last name to Court, keeping Altshiller as a middle name. He became a full Professor at the University of Oklahoma in 1935 and retired in 1951. Court's two other books are Modern Pure Solid Geometry, Macmillan, 1935, and Mathematics in Fun and in Earnest, New American Library, 1958.

Following is a nearly complete list of Court's mathematical publications in journals:

American Mathematical Monthly
39 (1932) 193-199 On the isodynamic points of four spheres
40 (1933) 265-269 On two intersecting spheres
41 (1934) 499-502 Notes on the orthocentric tetrahedron
43 (1936) 89-91 On the Cevian tetrahedron
44 (1937) 317f On mathematical nomenclature
55 (1948) 218-221 Notes on cospherical points
56 (1949) 312-315 A special tetrahedron
57 (1950) 684f Mathematics "au naturel"
60 (1953) 306-310 The semi-orthocentric tetrahedron
62 (1955) 59-65 Three mutually orthogonal real circles
63 (1956) 714-716 Some missing theorems on the anticomplementary tetrahedron
64 (1957) 241-247 Three hyperbolas associated with a triangle
66 (1959) 123-125 A desmic system of tetrahedrons
67 (1960) 241-248 Four intersecting spheres
69 (1962) 614-617 Five points in space

Boletin matematico (Buenos Aires)
14 (1941) 230f On the inverse points with respect to a sphere
15 (1942) 14-16, 25-28 On the anharmonic associates of a point for a triangle and a tetrahedron
15 (1942) 66f A generalization of a theorem of Thebault
28 (1955) 7-15 Pencils of conics

Bulletin of the American Mathematical Society
48 (1942) 583-588 On the theory of the tetrahedron

Duke Mathematical Journal
13 (1946) 123-128 A skew quartic associated with a tetrahedron
13 (1946) 3830386 The biratio of the altitudes of a tetrahedron
15 (1948) 49-54 Skewly Cevian tetrahedrons
17 (1950) 75-81 Semi-inverse tetrahedrons
19 (1952) 71-74 Isogonal points for a tetrahedron
20 (1953) 417-421 Pascal's theorem in space

Mathematical Gazette
36 (1952) Isogonal conjugate points for a triangle
50 (1956) 205-207 The harmonic and the polar transformations

Mathematics Student
2 (1934) 107-111 Tetrahedral poles and polar planes
3 (1935) 97-99 On desmic tetrahedra
10 (1942) 115-118 A porism on eleven spheres
20 (1952) 51-57 Orthological triangles
24 (1956) 217-226 On three intersecting circles

Mathematics Teacher
26 (1933) 46-52 The tetrahedron and its circumscribed parallelepiped
41 (1948) 104-111 Mathematics in the history of civilization
51 (1958) 369-372 Mascheroni constructions
52 (1959) 31f A historical puzzle
53 (1960) 33-35 Notes on the centroid
54 (1961) 444-452 The problem of Apollonius
55 (1962) 655-657 Notes on inversion

Mathesis (twelve articles in French)

National Mathematics Magazine
15 (1941) 271-277 On the centroid
17 (1943) 195-201 Theorems, their converses, and their extensions
18 (1943) 3-6 On the Cevians of a triangle
19 (1944) 141-146 Elements at infinity in projective geometry

Mathematics Magazine
37 (1964) 14-18 Imaginative mathematics

Scientific Monthly
60 (1945) 63-66 Geometry and experience
63 (1946) 249-256 The motionless arrow
67 (1948) 119-123 Is mathematics an exact science?
83 (1956) 28-34 Plane geometry and plain logic

Scripta Mathematica
3 (1935) 103-111 Art and mathematics
13 (1947) 79-85 Mathematical asides
14 (1948) 85-97 The tetrahedron and its altitudes
17 (1951) 55-64, 190-201 Imaginary elements in pure geometry - what they are and what they are not
17 (1951) 147-150 Fagnano's problem
19 (1953) 218f The problem of three bisectors
20 (1954) 5-13, 155-164 Desargues and his strange theorem
20 (1954) 113-120, 232-235 Castillon's problem
22 (1956) 45-52 The might and plight of reasoning
22 (1956) 193-207 The Cevian chain

Court also published many problem proposals and solutions in the American Mathematical Monthly and other journals.