Phil Selden was a male human in Starfleet in the 24th century. As of 2374, he held the rank of Commander, and held the position of commanding officer of Starbase 314.

That year, Selden called for an investigation of Dr. Elizabeth Lense, under the suspicion that, having beaten Julian Bashir as valedictorian of their Starfleet Medical Academy class, she had also been genetically enhanced. Selden kept Lense confined for a month, until he was convinced of her innocence. (SCE eBook: Oaths)