A wealthy geologist who, as a youngster in Smallville, was a close friend
of the teen-aged Superman. Late one
night, while on an overnight camping trip with Clark Kent and other
Smallville youngsters, young Pete Ross, lying awake in his tent long
after the other campers had fallen asleep, chanced to see his friend
Clark Kent changing into
Superboy (i.e., the teen-aged Superman) and
thus became, completely by accident, privy to the secret of Superman's
dual identity.
Then and there, Ross vowed to keep his knowledge secret, even from
Superman, and never reveal it to anyone else. On occasion, without
Kent's knowledge, Ross even masqueraded as the young Clark Kent to
help him preserve his secret identity.
To this day, Superman remains
completely unaware that Pete Ross shares his closely guarded secret.