Who's gone where this week at MasterCard, Optimal Group, and Asia Payment Systems.

Javier Perez was named president of MasterCard Europe, effective March 10. Perez reports to MasterCard’s chief operating officer, Alan Heuer. Perez joined MasterCard in 1996 and has been president of MasterCard's Latin America and Caribbean Region since 2004. (Contact: MasterCard Int’l, 914-249-5622)

Mitchell Garber resigned from Montreal, Canada-based Optimal Group Inc. on March 6 to pursue other opportunities. Garber was executive vice-president of Optimal Group, president and chief executive officer of Optimal Payments Inc. and executive chairman of FireOne Group PLC. Benjamin Dalfen, previously director and chief operating officer of FireOne Group PLC, was promoted to chief executive officer of FireOne Group, and Douglas Lewin became president of Optimal Payments. Lewin had been director and executive vice-president of Optimal Payments Inc. (Contact: Optimal Group Inc., 514-738-8885)

Rosaline Tam is joining the board of Hong Kong-based Asia Payment Systems Inc. Tam, a long-time payments veteran, replaces Matt Mecke, who resigned from the board. (Contact: Asia Payment Systems Inc., 760-918-5592)