http://en.wikipedia.org/wiki/Siren_Visual
Founder and managing director Nigel Rennard started Siren in 1987 as a music distribution company, and expanded to include VHS distribution in 1994, starting with the distribution of Anime from Manga Entertainment's UK division. It then expanded to acquiring Anime like Astro Boy and Pokémon. It expanded to distribution of Arthouse, Horror and Asian Cinema. In 1997 it was named the distributor for Madman Entertainment, who bought the Australian licenses to all Manga UK anime, and later on acquired licenses from ADV Films and Funimation. In 2001 Siren was no longer a home entertainment distributor and is now solely an acquisition company, after it lost its biggest client, Madman Entertainment who established its distribution arm, The AV Channel.
In April 2012, CEO Eric Cherry left Siren Visual to form a new company called Hanabee, which, like Siren Visual, is an anime distributor. Hanabee's first titles are Toradora!, Dream Eater Merry, Red vs. Blue (acquired from Siren Visual), and The Guild.
http://www.sirenvisual.com.au/Content/About.php
2009 saw Siren further expand it's range of anime, being the first company outside of Japan to release the experimental Genius Party and Genius Party Beyond collections.