Electronics Arts has a new head of its mobile division, who will be in charge of the company’s ongoing efforts to expand its game development from consoles and PCs to smartphones and watches. EA Mobile’s new chief, Samantha Ryan, has worked for the division since she joined the company in March, working on key titles like strategy game Plants vs. Zombies and a mobile version of simulation game The Sims. EA Mobile’s previous chief, Frank Gibeau, left the company suddenly after 20 years in May. Gibeau was considered a possible candidate to replace former CEO John Riccitiello after he left in 2013, but the chief executive job went to EA Sports head Andrew Wilson. Ryan said she hopes to keep the smartphone, arguably the most ubiquitous gaming device in the world, a primary focus at EA. “The power of mobile is that it not only changes how we make and play games, but it also expands our reach to entirely new types of players,” said Ryan in a statement. Ryan joined EA in from Warner Bros. Interactive Entertainment, the film studio’s video game wing responsible for the Batman: Arkham adventure games and the fighting game series Mortal Kombat. EA Mobile…