  Einstein's contribution to relativity is reviewed. It is pointed out that
Weyl gave first unified theory of gravitation and electromagnetism and it was
different than the five dimensional theory of Kaluza. Einstein began his work
on unification in 1925 that continued all through the rest of his life. A
discussion is presented on the recent advances in Weyl theory, and also on the
unification approach in which space-time is believed not to be fundamental. The
significance of the gravitational waves observed recently seems to indicate a
new paradigm of unification. It is suggested that the nature of time is the
most fundamental issue for a break-through in the unification quest.
