During the pandemic, organizational effectiveness remains at a very low level. Many universities are underperforming when a pandemic hits a country. When the pandemic subsided, the organization's effectiveness became exciting again This study aims to examine the effect of transformational leadership and years of service or experience of organizational leaders on organizational effectiveness, both directly and through organizational commitment, as intervening variables. The study adopted a quantitative approach and specifically the correlational verification approach. The study was conducted at the Public and Private SMAs in Samarinda, Indonesia, from January to August 2022. The study population consisted of 254 principals, vice principals and teachers, with a sample size of 145 selected through the proportional random sampling technique. The collected data were analyzed using smart PLS and SPSS software. The study findings revealed that there is no significant effect between transformational leadership on organizational effectiveness. The results show that the more experience the leader has, the more effective an organization is. The better the transformational leadership and the longer the experience as a leader, the more effective the institution will be. Organizational commitment does not effectively become a moderator variable in mediating the effect of transformational leadership and experience of leadership on organizational effectiveness.