Probably Kernighan and Ritchie. Ritchie invented C, Kernighan teamed up with him to write the first C programming book.

I can only assume this (copy-pasted from wikipedia)

The C Programming Language (sometimes termed K&R, after its authors’ initials) is a computer programming book written by Brian Kernighan and Dennis Ritchie, the latter of whom originally designed and implemented the C programming language, as well as co-designed the Unix operating system with which development of the language was closely intertwined