They are also confident that, by working together, we will ensure the most efficient transition for clients, associates and the community." John Muñoz, director of the Las Cruces Sitel, which is among the largest private employers in southern New Mexico, declined to comment on the closure and referred inquiries to the company's corporate headquarters in Tennessee. The organization's Albuquerque call centers have been adding employees through 2016, according to company news releases. Nationwide, Sitel employs 75,100 associates who support more than 400 clients from 146 facilities in 22 countries.