David Burgess’s review published on Letterboxd:
I learned of this movie as a trailer shown before the previous movie I just watched; Love & Friendship I didn't really like that movie but the one GOOD thing about watching it was learning about this one. The Man Who Knew Infinity is the kind of historical bio-pic / drama that I am always on the lookout and very rarely see. At least very rarely seen, done as well as this. Jeremy Irons is his consistently awesome self..and does his superb best in the movie but the stand out star for me has got to be Dev Patel who shines. The star who most would know from the Best Exotic Marigold Hotel movies plays a deeply moving portrayal of S. Ramanujan a mathematical genius struggling to be seen despite the bigoted refusal by the academics of the time. The friendship between Patel's character and that of Irons was heartfelt and genuine... This is definitely a movie that should be seen and enjoyed.