Saatchi & Saatchi/U.K. has appointed Chris Chalk and Adam Kirby to executive management-level positions. Chalk steps into the position of chief strategy officer following a tenure at Nokia, and Kirby assumes the role of executive director of business development and growth after three years at Diageo. ... New York-based visual effects company Guava has hired 3-D animator Steve Talkowski as director of animation, as well as signing onsite effects supervision, motion tracking and product animation specialist Dave Bernkopf and head technical director Adrian Graham for its 3-D animation department. ... Chris Allen, formerly senior producer at MPC, has joined London-based post production house Absolute as executive producer. ... New York-based design/post boutique Perception has hired Curt Neumann as art director. Neumann was formerly a designer at Zona Design. ... Marc Ruxin has been hired as chief operating officer of The Mill North America, and Alistair Thompson has been promoted to managing director of the visual effects company's New York branch. Ruxin was previously executive vice-president of strategy and account service for Gyro Group USA, while Thompson moves up from his position as executive producer of The Mill/NY.