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For more information about Paul R. Halmos (1916-2006) and about the Paul R. Halmos Photograph Collection, please see the introduction to this article on page 1. A new page featuring six photographs will be posted at the start of each week during 2012.

Abram Besicovitch (1891-1970) is pictured in his office at Trinity College, Cambridge, England (or possibilty his home in Cambridge) on June 8, 1968. A student of A. A. Markov at the University of St. Petersburg, where he earned his degree in 1912, Besicovitch taught in Russia during the revolutionary years. He finally escaped to Copenhagen in 1924, and eventually settled in England, where he was a functional analyst at Cambridge from 1927 onward. Besicovitch was a member of the Institute for Advanced Study in Princeton in 1954-55 and also visited various U.S. universities from 1958 to 1966. It is possible that his visits included the University of Chicago or the University of Michigan, where Paul Halmos taught during this period (he moved from Chicago to Michigan in 1961), and that the two became acquainted then. They certainly would have been interested in one another's mathematical work.

Halmos photographed R. H. Bing (1914-1986) in Miami, Florida on April 3, 1966. Bing was a Texas high school teacher turned R. L. Moore-trained topologist. He spent most of his career at the universities of Wisconsin and Texas. He and Halmos may have met at the Institute for Advanced Study in Princeton, where both were members during 1957-58. Bing served as president of the MAA in 1963-64 and as president of the AMS in 1977-78. In 1965-66 Halmos took a year's leave from the University of Michigan to teach at the University of Miami in Coral Gables, Florida. Two years later, the sun-seeking Halmos accepted a position at the University of Hawaii in Honolulu. In 1966, Bing was a professor at the University of Wisconsin; in 1973, he returned to the University of Texas, Austin, where he had earned his Ph.D. in 1945.

This photograph shows R. H. Bing (left) with Burton W. Jones (1902-1983) in 1981. Jones earned his Ph.D. from the University of Chicago in 1928, working under Leonard Eugene Dickson. From 1930 to 1948, he was a professor at Cornell University, where his second, third, and fourth Ph.D. students were representation theorist Irving Reiner (1947), MAA book series eponym Mary Dolciani (1947), and number theorist William LeVeque (1948). His very first Ph.D. student was Irma Moses Reiner (1946), who describes Jones as a "good, approachable, and available" Ph.D. advisor, who "provided an excellent problem and was helpful in conferences while I was working on it." In 1948, Jones moved to the University of Colorado, Boulder, where he spent the rest of his career, chairing the mathematics department from 1949 to 1963 and retiring in 1971. He published number theory and abstract algebra textbooks and a popular book on mathematics, *Elementary Concepts of Mathematics. *Both UC Boulder and the MAA Rocky Mountain Section have mathematics teaching awards named in Jones' honor.

Halmos photographed the American algebraist Garrett Birkhoff (1911-1996), far left, and the Iranian mathematical physicist Abolghassem Ghaffari, far right, at the Third Iranian Mathematical Conference in Tehran, Iran, in 1972. He identified the two women in the photo only as "Mrs. Ghaffari" and "R. Birkhoff."

Abolghassem Ghaffari studied and worked in Iran, France, England, and the U.S., before moving to the U.S. permanently in 1956. During the 1950s, he worked with Einstein and Oppenheimer in Princeton and, during the 1960s, he worked for NASA on the Apollo 11 mission. On June 15, 2011, Ghaffari celebrated his 104th birthday. The Ghaffari family is collecting photographs of A. Ghaffari and is particularly interested in photographs of him with Einstein and/or Oppenheimer. Please contact us if you can help.

Group and lattice theorist Garrett Birkhoff advised over 50 Ph.D. students during a long career at Harvard, but he may be best remembered for his abstract algebra text, *A Survey of Modern Algebra,* written with Saunders Mac Lane and more commonly known by its authors' surnames, "Birkhoff and Mac Lane." Halmos and Birkhoff probably would have first met when both were at the Institute for Advanced Study in Princeton in 1939-40.

Halmos photographed Errett Bishop (1928-1983) at Bishop's home in La Jolla, California, in February 1983. A Ph.D. student of Halmos at the University of Chicago (1955), Bishop spent his career at the University of California, Berkeley, and the University of California, San Diego (in La Jolla). He made important contributions to a number of areas of analysis, including its foundations.

Mathematical philosopher Max Black (1909-1988) at the AMS-MAA Joint Summer Meeting in Ithaca, New York, on Aug. 31, 1965. Black was at that time a philosophy professor at Cornell University in Ithaca, where he spent most of his career. Did he attend the mathematics meeting because it was in a convenient location for him, or did he regularly attend mathematics meetings?

For an introduction to this article and to the Paul R. Halmos Photograph Collection, please see page 1. Watch for a new page featuring six new photographs each week during 2012.

**Sources:**

- American Mathematical Society (AMS) Presidents (R. H. Bing)
- Archives of American Mathematics, Dolph Briscoe Center for American History, University of Texas, Austin. Information for which a source is neither cited nor given in this list either appeared on the reverse side of the photograph or was obtained by AAM archivist Carol Mead from various sources during 2011-12.
- Institute for Advanced Study Past Members (all mathematicians featured on this page except Black)
- MacTutor History of Mathematics Archive, St. Andrews University, Scotland (all mathematicians except Burton W. Jones)
- MAA Presidents (R. H. Bing)
- MAA Rocky Mountain Section (Burton W. Jones)
- "Burton W. Jones,"
*Boulder Daily Camera,*Jan. 10, 1983 (obituary) - Jones, Burton W. and Wolfgang Thron,
*A History of the Mathematics Departments of the University of Colorado*(1979), p. 17. Thanks to William Jones and Judith Packer of the UC Boulder Mathematics Department for providing copies of this item and the preceding one. - Mathematics Genealogy Project, North Dakota State University (all mathematicians)
- Pars Times, Payvand Iran News, Persian Mirror (Abolghassem Ghaffari)

Janet Beery (University of Redlands) and Carol Mead (Archives of American Mathematics, University of Texas, Austin), "Who's That Mathematician? Paul R. Halmos Collection - Page 6," *Loci* (January 2012), DOI:10.4169/loci003801