Question

Which scientist was first thought to describe light as having wave-like properties?

Answer 1

@broken_symmetry

Answer 2

We just did this one, look:
http://openstudy.com/study#/updates/531752ece4b0572ef0fb9fe2

Answer 3

Do you mean particle-like?

Answer 4

Newton
Einstein
Young

Answer 5

If the question is
"Which scientist was first thought to describe light as having particle-like properties?"

The particle theory of light was actually first proposed by Hobbes and Gassendi, but I guess the answer you want is Newton.

Answer 6

Hooke, Huygens... maybe even someone before them.