John is best known for his very loud and very funny diary room confessionals. Despite being one of the most nominated HouseGuests in Big Brother history, he managed to get off the block four times by winning 3 PoVs and 1 BotB. His closest allies were Becky Burgess and Steve Moses, and his primary target was Vanessa Rousso since he was the only person in the house to realize how much of a threat she was. In week 9, John and Steve were both nominated for eviction, and ultimately he was evicted unanimously. However, he managed to re-enter the game by winning the jury buyback competition. Upon returning he started working with his arch-nemesis Vanessa and made Austwins his new targets. Despite managing to lay low and improve his social game with the remaining houseguests, Vanessa evicted him on day 91 because of her suspicions of a possible final two deal made with Steve. He placed 4th and became the 8th member of the jury.
On finale night, John along with Jason and James was revealed to be the top three to win America's Favorite HouseGuest but lost to James.
He is secretly a super fan of the show but kept that status a secret to avoid being targeted. John also tied with male PoV record with 4 wins, which is shared by James Rhine and Shane Meaney. He became the first male in Big Brother history to save himself three times with the Power of Veto. Some of his fellow houseguests such as Steve, Liz Nolan and Vanessa suspected he was some sort of Twist due to his actions in the house.
John (aka Johnny Mac, the Rock Star Dentist) is unlike any other dentist. He is loud, goofy, and never seems to run out of energy. Recently, he’s taken up running Tough Mudder marathons and is excited at the prospect of having a few showmances. Single and proud of it, if any girl wants more of a relationship, he has a sure-fire way of getting out of it—he'll start acting completely annoying and geeky, so they end up dumping him and no hearts are broken. He's a closet super-fan and wants to win so he can save his parents’ lake house and finally pay off his school loans.
John is from Scranton, PA and attended undergrad at Penn State and medical school at Temple. He plays guitar and bass guitar, though he wants to learn how to play the electric violin next. His favorite musicians include Dave Matthews Band and Skrillex, though he said he listens to all music except country.
John is tied with Spencer Clawson for most nominated male houseguest with 9 nominations.
Victoria Rafaeli holds the record for most nominations in a single season with 10.
John is tied with Amy Crews and Sharon Obermueller for longest surviving player who was evicted and came back in Big Brother (US), reaching the Final 4. He is the longest surviving male who was evicted and came back.
John is tied with Liz for the third most competitons won in Big Brother 17 with 5. James is in second place having won 6 competitions while Steve and Vanessa are tied for first, both having won 7 competitons.
Without the Battle of the Block, John and Liz are both tied with James for the third most competitions won in Big Brother 17 with 4 competition wins each, while Steve is in second with 6 and Vanessa is still in first with 7.
John won the most Power of Veto competitions in Big Brother 17 with 4 PoV wins.
Despite not winning any HoH's, John often placed 2nd or 3rd in several HoH competitions.
At the jury round table, he criticized Liz Nolan for not making her own moves by nominating two people that were going after Vanessa. He was proven right when Liz stated that she was in the Final Two because of Vanessa and Austin making decisions for her.