Athenaeum was an alternative pop rock the band home-recorded demos in 1994, The Unofficial Demo, and later a self-titled eight-song EP in 1995, widely known as Green Album. Selling approximately 10,000 copies, Brewster also dissolved his membership with the group and was replaced by Mike Garrigan, the lead singer and songwriter of Collapsis.
This new line-up played their first show March 31, 2001, at Ziggy's in Winston-Salem, North Carolina. The new set included Garrigan's Collapsis anthem, "October".