This paper reviews several neo-Weberian ideas about social class for understanding patterns of men's career mobility. Special attention is devoted to the non-Marxist concepts of social class advocated by Giddens, Sorokin, and Parkin. Further insights are provided by an analysis of data for 20,000 men in the experienced American civilian laborforce. The data are fit with a loglinear model and then further analyzed with multidimensional scaling techniques. The data analysis discloses three broad categories of social class that consist of farmers, manual, and nonmanual occupations. The findings also revealfurther subdivisions in which professionals and skilled craft occupations form distinct classes within the nonmanual and manual categories. A third, much smaller, subdivision exists between semi-skilled operatives and unskilled laborers. These findings support neo-Weberian social class concepts. These results are also compared with Breiger's (1981) research on intergenerational mobility. This comparison shows that patterns in career mobility reveal a simpler picture of class structure than the eight class categories that Breiger reports for intergenerational mobility. The conceptual implications of these findings are discussed.