Brian Marick was one of the guys that wrote the agile manifesto. He also wrote the "Functional Programming for OO Programmers" book, which has a lot of readers on LeanPub.
At the end of May he's going on "crusade" at XP2016 in Edinburgh, UK to ask what agile can learn from FP. He's got a lot of ideas, but he's looking for more, so please add comments/replies to his blog post: https://xp2016blog.wordpress.com/2016/04/03/crowdsourcing-a-topic-part-2/