Despite the mounting research demonstrating that employee seniority positively relates to creative job performance, However, synergy diversity climate eliminates the employee seniority– creative job performance relationship by unleashing the creative potential of organizational newcomers. This study aims to explore how employee seniority influences innovation and creativity. For this, we proposed a theoretical framework building upon Richard et. al. (2019) conceptualization to include the effect of LMX and innovation. We argue that employee seniority improves their creative process engagement (CPE), as well as enables better Leader-member exchange (LMX), these two would in turn improves Creative Job Performance (CPERF), And Innovation (INNO). We also contended that synergy diversity climate (SDC) negatively moderates the effect of seniority on CPE, LMX, CPERF, and INNO, in a way that higher SDC would lower the influence of seniority on the above mentions four variables. The quantitative approach had been applied for data collection using purposive sampling. The target population was the employees of manufacturing firms in Karachi, Pakistan. The sample size was based on 309 sample responses analyzed using PLS-SEM through Smart PLS 3.2.9. The results have shown that employee seniority has a positive and significant effect on creative process engagement, creative performance, innovation, and leader-member exchange. Creative process engagement and LMX also seem to have a positive and significant effect on creative performance and innovation. Hence CPE and LMX have a significant and positive mediation effect on seniority and creative performance and innovation relationships. Furthermore, the results have shown that diversity negatively and significantly moderates the effect of leader-member exchange and seniority on innovation. This means that the effect of seniority and LMX on innovations are greatly reduced in presence of a synergy diversity climate. On the contrary, diversity has a positive and significant moderation effect between seniority and creative process engagement, and creative performance. Implying SDC strengthens, (not weakening) the effect of seniority in the case of performance and engagement. Moreover, there are also major managerial ramifications in the forms in which the study strengthens theory. First, it demonstrated that by promoting positive psychological diversity climates, especially the synergy type, organizations stand to benefit
