You try

" If you could send me your resume and a few lines describing your background and interests (two-three sentences is good :) ) that would be helpful!"

Hm. My whole life and future in 2-3 sentences? Tough assignment. My answer:

I am interested in the intersection of development and ethics (How can we ensure international development is done ethically? How can we help develop ethical people?). My interest has led me to work in different substantive fields, of which I am drawn most toward public health, economic, and political development.

You try. It's hard!