Leo has been involved with Internet operations and unique identifiers since the late 1990s. He currently runs And Polus LLC, which provides bespoke services to Internet infrastructure organisations. Previously, he managed Internet Number Resources in ICANN's IANA team, and registration services at the RIPE NCC.Through participation in RIPE and IETF, Leo is the author of several RIPE documents and a handful of RFCs dealing with Internet Number Resources.