Malinge is neither a founder nor a partner of ARCH, but he is listed as a Venture Partner:

"A Venture Partner is a person who a VC firm brings on board to help them do investments and manage them, but is not a full and permanent member of the partnership. The "full and permanent" members of the partnership are often called General Partners, Managing Members, or Partners. Lawyers don't like the term General Partners and more and more firms are avoiding that term. Venture Partners are different from "Entrepreneurs In Residence" (EIRs) because they are expected to source multiple deals and manage them whereas an EIR is expected to source a single deal and then leave to run it." (Source: http://avc.com/2010/08/what-is-a-venture-partner-and-does-it-matter-to-you/ )