The Production Farm -- the production arm of New York-based creative/production hybrid The Concept Farm -- has signed fashion and celebrity photographer Len Prince to its roster of commercials directors. ... Mike Czerniuk, formerly of The Flux Group, has joined Bazooka -- the graphics department of Chicago edit house Swell -- as creative director. ... At Eisner Interactive in Baltimore, Jack Lizmi and John Marshall -- both formerly freelancers -- and Trista Snyder, formerly of Lippincott Williams & Wilkins, have joined the agency as project managers. Steve Gladstone has signed on as an online campaign manager. ... Sophie Edwards has been promoted to head of sales at New York post house Creative Bubble and its audio division, Burst.