Steve Rabosky, chief creative officer of Saatchi & Saatchi/L.A., has left the agency. Harvey Marco, executive creative director, will carry on as the shop's creative leader. ... Roe Bressan, the former managing director at Whitehouse/N.Y., Spontaneous and Red Car/N.Y. has launched Navigating, a production and postproduction management consultancy. ... Vinton Studios, which was absorbed by Laika in July, will be known as Laika/House effective immediately. Lourri Hammack will replace Paul Golden--who left to pursue other interest--as president.