derives numerous empirically testable implications. (9) Collaborative research and John Skvoretz. A major feature of modern science is collaborative research in which the distinctive skills of the participants combine to produce original research. Skvoretz, in addition to this other contributions, has been a frequent collaborator in a variety of theoretical research programs, often using mathematical expertise as well as skills in experimental design, statistical data analysis and simulation methods. Some examples are: (1) Collaborative work on theoretical, statistical and mathematical problems in biased net theory. (2) Collaborative contributions to Expectation States Theory. (3) Collaborative contributions to Elementary Theory. (4) Collaboration with Bruce Mayhew in a structuralist research program. From the early 1970s, Skvoretz has been one of the most prolific of contributors to the advance of mathematical sociology. The above discussion could be expanded to include many other programs and individuals including European sociologists such as Peter Abell and the late Raymond Boudon. Awards in mathematical sociology The Mathematical Sociology section of The American Sociological Association in 2002 initiated awards for contributions to the field, including The James S. Coleman Distinguished Career Achievement Award. (Coleman had died in 1995 before the section had been established.) Given every other year, the awardees include some of those just listed in terms of their career-long research programs: 2020: Noah Friedkin, University of California, Santa Barbara 2018: Ronald Breiger, University of Arizona 2017: Lynn Smith-Lovin, Duke University. 2014: Philip Bonacich, University of California, Los Angeles. 2012: John Skvoretz, University of South Florida. 2010: David R. Heise, Indiana University. 2008: Scott Boorman, Yale University. 2006: Linton Freeman, University of California, Irvine. 2004: Thomas Fararo, University of Pittsburgh. 2002: Harrison White, Columbia University. The section's other categories of awards and their recipients are listed at ASA Section on Mathematical Sociology Texts and journals Mathematical sociology textbooks cover a variety of models, usually explaining the required mathematical background before discussing important work in the literature (Fararo 1973, Leik and Meeker 1975, Bonacich and Lu 2012). An earlier text by Otomar Bartos (1967) is still of relevance. Of wider scope and mathematical sophistication is the text by Rapoport (1983). A very reader-friendly and imaginative introduction to explanatory thinking leading to models is Lave and March (1975, reprinted 1993). The Journal of Mathematical Sociology (started in 1971) has been open to papers covering a broad spectrum of topics employing a variety of types of mathematics, especially through frequent special