Barak Engel is known for having come up with the notion of "virtual CISO" back when security was a four-letter word that no one could spell correctly. He stubbornly insisted on selling the concept anyway, and ultimately developed a consulting practice around it. Almost two decades later his company, EAmmune, develops and manages security programs for organizations across all industries. Barak himself has served as CISO for many of them (e.g. MuleSoft), and often several at once.