Throughout his life in horology, Mueller-Maerki has been a leader in the National Association for Watch https://www.crwmontres.com/ and Clock Collectors, including as https://www.iworologi.com/ head of the NAWCC Library Collections Committee, NAWCC Board member, and Silver Star Fellow (their highest honor). His prolific writings about horology are an important scholarly resource, including articles for the NAWCC Bulletin on diverse topics: longcase clocks, astronomical dials, and how https://www.iwmontres.com/Collection/ingenieur/ watches were used to identify the dead during World War I.