April 25, 2017 0811 GMT
'When Breath Becomes Air' has now been shortlisted for the prestigious the 2017 Wellcome Book Prize, which recognizes books about health or illness, BBC reported.
Kalanithi's book is one of the six-strong shortlist for this year's Wellcome Book Prize.
Kalanithi's memoir chronicles his journey from medical student to neurosurgeon, patient and father before he died while still writing the book.
According to thebookseller.com, the acclaimed book is the first posthumously published title to be in contention for the £30,000 prize.
Gates declared on his blog: "This is the best non-fiction story I've read in a long time."
The winner of the prize will be announced on April 24.
It is the first posthumous work to be considered for the prize, where both non-fiction and fictional books are eligible.