Mile 9 Agency hired Katy Thomas as an account executive.

Jimi Smoot has joined PK4 as vice president of product development.

Martha Stewart Living Omnimedia named Peter Medwid as senior vice president and publisher for Martha Stewart Living.

Gina Valo joined Signpost as vice president of operations.

The Mill L.A. promoted Arielle Davis to head of production and hired Lusia Boryczko as design producer.

Pitch hired Eric Springer as chief creative officer. Previously, Springer worked at Deutsch/LA where he served as executive vice president, group creative director on numerous accounts, including VW.

Emanate hired three new vice presidents to its team. Trey Ditto, Greg Jawski and Ryan Murphy.

Callie Schweitzer was promoted to deputy publisher at Talking Points Memo, up from assistant to the publisher.

Jumptap named Bob Hammond as chief technology officer.

Sasha Savic was named CEO of MediaCom USA. Prior to joining MediaCom, Savic worked as chief operating officer for Havas Media Group North America.