Jan Gullberg

He practised as a surgeon in Saudi Arabia, Norway and Virginia Mason Hospital, Seattle in the United States, as well as in Sweden.

His first book, on science, won the Swedish Medical Society's Jubilee Prize in 1980, and saw him promoted to honorary doctor at the University of Lund the same year.

Gullberg's second (and last) book, Mathematics: From the Birth of Numbers, took ten years to write, consuming all of his spare time.

[4] Allen is delighted by the chapter on combinatorics, with its approach to graph theory and magic squares, complete with 1740 map of the seven bridges of Königsberg (which have to be traversed exactly once).

He records that he finds its introductory accounts useful for engineers who use maths only occasionally, and suggests how the book could be used for undergraduate students.

He concludes by describing the book as "gigantic ... in every sense" (it weighs 4 pounds 13 ounces, is 1100 pages long) and was 10 years in the making, and calls it "a giant leap forward for mathematics and all those who love it!".