McInnes yesterday left Scottish outfit St Johnstone to replace Keith Millen at Ashton Gate, taking assistant Tony Docherty along for the ride, and Sexstone indicated that an impressive performance in a two-hour interview landed the 40-year old the job.
"We're delighted to welcome Derek and Tony to Bristol City FC," Sexstone said.
"Throughout the process we received applications from a host of very strong candidates but, in the end, Derek stood out above all others.
"Derek was the unanimous choice of the board of directors and majority shareholder.
"He's an impressive character who is very highly rated in the game and comes here on the back of a superb stint at St Johnstone. His passion, his great track record - he's a manager on the up with a real understanding of the game.
"Derek has the drive and energy that proved to us he was the right man to take the club forward, both in the short-term and - even more importantly - in the medium to long-term.
"I'm sure our supporters will give Derek their full backing, starting this Sunday for our home game with Birmingham City, as we begin a new era and strive to move up the Championship table and beyond."
McInnes and Docherty have both signed deals which will keep them in Southwest England until 2014.