There is a professor I have had regular meetings with since the first semester in my department. When the time came that I was searching for research opportunities in my area of interest (lithium ion batteries), I talked to that professor about it and he recommended a professor in another department who is gaining a lot of recognition recently in the specific field. Long story short, he accepted me to be a research assistant in his lab where I have worked over two years under him which includes two URP grants for two different projects. In August of last year, I was awarded the Excellent Prize for my research project that I presented at the campus-wide KAIST URP Workshop.
After the completion of my URP he recommended me to another professor, with a similar research interest but different focus. These professors are also the ones who have successfully recommended me to the graduate schools and jobs that I applied for, including my current position at PETRONAS.