The 32-year-old actor was lavishly praised by fans and critics for his intense performance of a college student, whose turbulent love story turns him into a rockstar in the romantic saga.
Ranbir is again collaborating with the duo in his upcoming movie 'Tamasha', which also stars his 'Yeh Jawani Hai Deewani' co-star Deepika Padukone.
"Their contribution to the film industry is well known and to my career it has been immense. I cherish working with Imtiaz. He and Irshad are responsible for what I have achieved in Bollywood with 'Rockstar'.
The 'Barfi!' star, who along with Imtiaz released Irshad's new book of poems here, said he finds poetry difficult to comprehend but is learning from the lyricist on the sets of 'Tamasha'.
The actor has always maintained he would love to venture into direction sometime in future but does not think himself capable enough to take up writing.
"Writing requires certain kind of skills, which I don't think I have. I think I can't write, just like I can't take to singing," he said.
"I think stress and anxiety are important. Without them, one tends to remain content, which limits the performance," the actor said.
