Moriz Winternitz (Horn, December 23, 1863 – Prague, January 9, 1937) was a scholar from Austria who began his Indology contributions working with Max Müller at the Oxford University.
...We shall probably have to date the beginning of this development to about 2000 or 2500 BC
We cannot explain the development of the whole of this great literature if we assume as late a date as round about 1200 BC or 1500 BC as its starting-point.