Archibald O. Haller (1926-2018) was a University of Wisconsin (Madison) Emeritus Professor of Community and Environmental Sociology in the College of Agriculture and Life Sciences and of the Department of Sociology in the College of Letters and Science.
He was known for his research on societal stratification (a field commonly called 'social class') and on the field's history from Ibn Khaldun in 1377 to 2018. His research employed empirical data from both the United States and Brazil, the latter country chosen because of its extreme inequality and its excellent national data sets. The focus of his American research (Wisconsin Model) was on the processes of status attainment--how youths enter their lifetime status trajectories; much of this research was done with Joseph Woelfel, Edward L. Fink, Alejandro Portes, and William H. Sewell. The focus of his Brazil research was on the structural characteristics of stratfication systems and the ways these may vary over time and from place to place.
His autobiography, published by RAH press, is available at aSociologist2014 and his CV is available from University of Wisconsin at http://dces.wisc.edu/wp-content/uploads/sites/30/2013/08/hallercv-20121.pdf.
An overview he wrote about collaborators and students who worked with him over the years is available as a .pdf at: http://www.galileoco.com/hallerlit/HallerCollaboratorsStudents.pdf
Much of his work is available at http://www.galileoco.com/CEtestlit/haller.asp, including the recently added "Haller's Laws" of research innovation.
...and his newest Kindle book, Stratification: The Theory of Societal Inequality, is available here: http://www.amazon.com/Stratification-Theory-Societal-Inequality-ebook/dp/B00DRLSWAO/ref=sr_1_3?ie=UTF8&qid=1378954083&sr=8-3&keywords=archibald+haller