Francis Desouza, CEO of Illumina, a life science tools and services company, leaves. FAP, June 11 / PRNewswire-FirstCall-Asianet /-- Francis Desouza, CEO of Illumina, a life science tools and services company, resigned, effective June 11. Charles Dadswell has been appointed interim CEO and the company's board of directors is searching for the next CEO. Desouza will remain in office as a corporate consultant until July 31.