Question

Whose work predicted that mass could be converted into energy and vice versa?

Answer 1

Albert Einstein

Answer 2

Hey there,

Your question states: Whose work predicted that mass could be converted into energy and vice versa?

This person who predicted that that mass could be converted into energy and also vice versa was a man known to be called Albert Einstein. He was a professionalize in theoretical physicist.

Hope this helps.
~Jurgen