Police said the teens are considered witnesses and have been cooperative in meetings with investigators. The adult is being characterized as a "person of interest" in Saturday's assault, which left David Lamont in a coma.
Police said they don't believe anyone else saw the attack, which occurred shortly after midnight on Middleton Place when Lamont went to a residence in his neighborhood to complain about loud teenagers.
"We do not intend to make an immediate arrest or disclose the identities of the involved subjects as the investigation is currently ongoing," police said in the public announcement. "Although Mr. Lamont remains in critical condition in a local hospital, detectives are hopeful they will be able to speak with him in the future to determine his recollection of the incident."
The Pleasanton Police Department is asking for the assistance of anyone who may have information related to this crime. They are encouraged to call the Pleasanton Police Department at (925) 931-5100.
Lamont is the founder of a marketing firm called Marketsage, according to his LinkedIn profile, a company that helps firms sell IT products.