John P. Holland

John P. Holland was an American psychologist and professor renowned for his work in career development and personality types. He developed the Holland Codes, a framework that classifies people and job environments into six categories: Realistic, Investigative, Artistic, Social, Enterprising, and Conventional (RIASEC). This model helps individuals understand their interests and strengths in relation to career choices, promoting more fulfilling job satisfaction. Holland's theories emphasize that aligning personal values with occupational environments can lead to greater success and happiness in one's career. His work has significantly influenced career counseling and vocational guidance worldwide.