Hobbs, who has joined the Tigers from Leicester until the end of the season, spent two years working under Pearson and the current Hull management team at the Walkers Stadium.
"As soon as I heard of the interest from Hull City it was an easy decision for me," said former Chelsea defender Hobbs.
"I know the management staff well from their time at Leicester and Hull City are at the top of the form guide and looking to go places.
"It was an easy decision and everything has gone through quite quickly, so I'm delighted to be here.
"He's doing a good job here and the management staff he's got here are fantastic. I hope to keep improving and keep learning while I'm here."