Tony was a friend of Jack Maitland.
One time, Tony and two other friends went to Jack's sister's flat flat to drink and play poker. Tony managed to win over all of Jack's bets so the latter foolishly gambled Rex the Coelurosauravus (who was priceless). Tony won and ended up taking Rex home. (Episode 3.6)
Tony put Rex up for auction on the internet and bids went as high as £3000. Connor Temple cornered him at his house and demanded that he hand Rex over. Tony initially refused, sneering "you and whose army" at Connor, though he quickly reconsidered when Connor revealed Captain Becker and two Special Forces soldiers armed with their weapons and so Rex was returned to Abby's flat. (Episode 3.7)