Markham Cronin, formerly of WestWayne/Atlanta and Crispin Porter + Bogusky, has joined Carmichael Lynch, Minneapolis, as partner and group CD. Cronin will oversee creative for Northwest Airlines. ... Sound designer Claude Letessier, whose credits include BMW Films' The Hire and numerous features, has signed with Santa Monica-based music and sound house Stimmüng. ... Animation director Bryan Huo, formerly of Topix, has joined Toronto's Guru Animation Studio. … Brian Malloy, formerly of Manhattan's Ad Store, has joined the CBK Group in Paramus, N.J., as a copywriter.