To use or not to use rec letter from PhD student

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sunnyisland

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Hello!

Did a good amount of public health research and worked under a PI who is a 6th year PhD student. There is no professor leading the project, just this grad student whom I approached first to work on a project with who was my primary mentor/supervisor. I asked them for a letter of rec, which is super strong so no worries. But I'm concerned that adcoms might misunderstand the position of the grad student I worked with. This person led an aspect in a larger project, as in many social science/public health fields, and isn't someone working in a research lab with a head PI. We can call them Person A.

I also asked another person, Person B, with whom we worked with in the research project to write me a letter. They reached out to the grad student and I to collab on this research project, but I didn't work as closely with them. This person is more senior, earned their PhD and are now a director at another non-profit. Should I use this letter over my Person A letter? They are very nice, but may not speak as in depth to my research expertise as Person A would?

I don't know what to do. Let me know your thoughts.
 
If this is a PhD graduate student, then he/she must have some faculty advisor or chair who can co-sign the letter
Okay I'm inquiring into this, thanks! Will a cosigned letter be considered adequate?
 
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