Cassel Massan
From The Stargate Omnipedia
Genii citizen, personal assistant to Ladon Radim during his time as Genii leader. Massan may have been Acastus Kolya's leak in Radim's administration. When Colonel John Sheppard was captured by Kolya (using secure Genii I.D.C. codes), Massan was placed into custody for questioning.
KEY EPISODE
Common Ground - Ladon Radim's trust in his inner circle is fractured when codes given to him by Atlantis are used by the Genii renegade Kolya for his own purposes.