Nanogen last week announced that David Ludvigson, its executive vice president and chief financial officer, has replaced Bruce Huebner as president and chief operating officer. Ludvigson will report to Howard Birndorf, founder, chief executive officer, and chairman of the company, which is developing an electronic microarray platform for diagnostic applications.

Huebner stepped down to pursue other interests, but will stay at the San Diego-based company for several months in a transition capacity, the company said in a statement.