Holland theorized six distinct worker personalities (Realistic, Investigative, Artistic, Social, Enterprising, and Conventional). This is often referred to as RIASEC. The theory includes six work environments that correspond to the same personality types (Realistic, Investigative, Artistic, Social, Enterprising, and Conventional). Although people possess aspects of each type, the general thesis of the theory is that salient types (work personalities) will emerge in each individual. Holland’s work represents a significant contribution to career development and counseling. Understanding Holland’s focus on interests as expressions of personality aids career counselors and student development specialists in helping students gain critical self-understanding. Exploring the match between personalities and work environments is a fundamental aspect of applying this theory to student development. Helping students to explore and learn about different careers that may be of interest to them is congruent with the goals of higher education institutions and student development theories.