Supermassive Black Holes (SMBHs) are ubiquitous in the contemporary universe.

But when and where did they form? Recent discovery of quasars hosting SMBHs

more massive than a billion solar masses at redshifts z > 7, when the universe

was less than 700 Megayear old, provides a substantial challenge to current

paradigm of a hierarchical structure formation, which tells us that massive objects

form late in the history. In my talk, I will discuss the latest progress (in) and our

contribution to understanding of formation of these most enigmatic objects.