The Effect of Principal Leadership, Organizational Culture, Job Satisfaction and Work Motivation on Teacher Performance of Vocational High School in Medan City

. The research aims to analyze the effect of: (1) the ability of the principal to lead on teacher satisfaction at work; (2) organizational culture in schools on teacher satisfaction at work; (3) the effect of the principal's ability to lead on the teacher's motivation to work; (4) the influence of organizational culture in schools on teachers' motivation to work; (5) the influence of the principal's ability to lead on teacher performance; (6) the influence of school culture on teacher performance; (7) the influence of teacher satisfaction at work on teacher performance; and (8) the influence of teacher motivation in working on teacher performance. The research subjects were teachers of State Vocational Schools of Technology and Engineering in Medan City. The sample is 174 people. The research method is path analysis. Based on the hypothesis testing: (1) the ability of the principal to lead on teacher satisfaction at work is 4.8%; (2) school culture on teacher satisfaction at work by 2.3%; (3) the ability of school principals to lead to teacher motivation at work is 7.8%; (4) school culture on teachers' motivation to work by 3.4%; (5) the ability of school principals to lead to teacher performance is 16.2%; (6) school culture on teacher performance by 7.6%; (7) teacher satisfaction at work on teacher performance of 4.6%; and (8) teacher motivation in working on teacher performance by 10.2%. The results showed that the principal's ability to lead, school culture, teacher satisfaction at work, and teacher motivation in working on teacher performance was 59.7%, and the rest was determined by other conditions.