* Charles Rivkin has been promoted to...

* Charles Rivkin has been promoted to chief operating officer of Jim Henson Productions. Most recently, as senior vice president of finance and operations, Rivkin played a pivotal role in successfully steering the company through the transitional period following Jim Henson’s death.

Peter Schube, vice president of business and legal affairs, has relocated from New York to company headquarters in Los Angeles.

Debbie Freeman has been promoted to vice president, corporate controller. Most recently, Freeman held the position of corporate controller.

Butterfield & Butterfield, a San Francisco-based fine arts auction house, announced the appointment of Grace Lowe Russak to the position of vice president and director of business development for Los Angeles. She will oversee expanding business development efforts at the Los Angeles gallery, with a particular focus on trusts and estate services.