Howard Rappaport

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Captain Howard Rappaport was a 24th century Starfleet officer and commander of the USS Einstein. He was short and stocky. In 2380 Captain Rappaport was assimilated by the Borg during the course of the investigation of the derelict Borg Cube in Sector 10. Serving as an adjunct of the Borg Queen, Captain Rappaport became known as Two and remained in command of the now assimilated Einstein. He survived the Second Battle of Sector 001 aboard the Einstein and was tasked with assimilation of new planets due to the loss of the Queen, apparently as the de facto leader of the Borg Collective. (TNG novel: Before Dishonor)