Minnepolis agency Olson & Company has announced several new hires. Riley Kane, formerly of Merkley Newman Harty/New York, and Eric Husband, formerly of Colle McVoy, Minnepolis, have joined the agency as copywriters, and Liz Otremba, also from Colle McVoy, has come aboard as an art director. Charlie Ross, formerly of Duffy Design, joins the shop as a designer. ... Ann Rubenstein, formerly a senior producer, has been promoted to executive producer at DDB/Chicago. ... In Miami, Jeff Sternberger, formerly of Jefferson Edit, and Mike Coe, formerly of Coe Creative Post, have launched an editorial house dubbed JefCo. ... Sound designer Bryan Klumpp has signed with Audi02 in Southfield, Mich., for exclusive representation. ... Audio engineer Scott Persson, formerly of Blast Digital, has joined Manhattan music and sound house Headroom.