Kavish Shah

I had a quick question regarding my PhD applications and would greatly appreciate your insights.I currently have three strong letters of recommendation from immediate former PIs who directly supervised my work. However, I wanted to ask how essential it would be to obtain a recommendation from my current PI at this stage. During my interview for the research specialist role in my current position, my PI mentioned that the position would span two years, though no formal contract was signed. I have been with the lab for four months now, and I am wondering if I should ask my PI for an LOR. Given this context, would you advise that I seek a recommendation from my current PI, or would the three letters from my former supervisors suffice?