Previous studies of turnover have focused mainly on factors influencing turnover intention or turnover behavior. Fewer studies delve into career outcomes after individuals’ turnover. However, turnover is not the end of the decision-making process. Due to the boundaryless career (Arthur, 1994) and extensive job mobility in the modern workforce (Stewart, 2002), it is timely to know the effect of turnover on individual career evolvement. The three essays in this dissertation will delve into turnover and career outcomes using data of the science, technology, engineering, and mathematics (STEM) personnel in the United States. The first essay explores the effect of past voluntary and involuntary turnover on individuals’ job satisfaction, salary, and number of people supervised. The second essay compares gender differences in voluntary turnover patterns and the effects of voluntary turnover on career outcomes. The third essay delves into STEM personnel job mobility across the public, private, and nonprofit sectors, with a focus on sector switch and job satisfaction change.