The phrase "important contributor" refers to someone or something that makes a valuable and significant contribution to a particular situation, cause, project, or overall success. They play a crucial role and have a positive impact. Full definition
To become as one of the most important contributor as a production technician by working honestly, effectively and smartly. (sampleresumeobjectives.org)
Student achievement has been identified as important contributor to economic growth. (semanticscholar.org)
However, race and gender become important contributors to diversity in a society where those differences are commonly used to set groups of people apart. (sciencemag.org)