Terence Tao is amazing. Of course he is extremely gifted- he was awarded the Fields Medal at the last ICM in Madrid in 2006- but in addition, he is articulate, prolific, and intellectually very generous. He can not only write at the most advanced level- we have his Analysis I and II listed in our Mathematics section (both a part of the superb TRIM series of books in mathematics from the HBA, New Delhi), but also for a less specialist audience.
Vol I: Rs 550, 365 pages, ISBN: 9788185931944
Vol II: Rs. 350, 236 pages, ISBN: 9789380250656