Richard Stallman (or RMS) is the president of the Free Software Foundation (FSF) and founder of the GNU Project.
The GNU/Linux interjection is a copypasta based on Richard's rant and his other writings over the years.
In early-mid 2011 Stallman released a rant-like post about the name of the Linux operating system and why, while everyone calls it Linux, it should actually be called GNU/Linux. The rant was used on /g/ as excellent copypasta for trolling.
- See: GNU/Linux rant
At a conference in Brazil, Stallman was angered by an audience's failure to understand his English. Stallman then cursed at this failure and banged his microphone against a table onstage.