Freelancers Melissa August and Scott Valins have joined New York design and production company Spontaneous as a senior producer and senior designer, respectively. ... New York effects and design studio Pure has expanded its staff with the addition of senior producer Bill Denahy, designer Araminta Atherton and CG designer/animator Dustin Linblad. ... Freelancer Melanie Barti has joined The Hive Advertising in San Francisco as an associate creative director. ... Editor Nick Lofting, formerly of Chrome, has joined Union Editorial in Santa Monica. ... Bob Samuel, formerly director of broadcast production at New York agency Gardner Nelson & Partners, has joined Coreaudiovisual -- which currently has offices in St. Louis and New York -- as managing director. ... Jon Merrifield, former principal of Santa Monica's Fence Post, has joined Milagro Post in Southfield, Mich., as the company's lead designer.