Relevance does agile consulting with their own unique process which mixes and matches many agile methodologies. Their standard workflow involves 2-week iterations, daily stand-ups, and they pair on everything as much as possible (QA, programming, management, etc). They also build in a small amount of time to experiment fore every iteration, but each experiment must have metrics to see if it was beneficial. Relevance also has "open source Fridays" where they take some time to work on open source or non-profit software.
Justin Gehtland is the president and co-founder of Relevance, LLC. Seven years ago it was founded as a Java and .NET consultancy, but it has grown since then in technical breadth and in team size. Clojure is one of the languages that Relevance is focused now.