Stephen Robinson says there was "no way" he could turn down the Aberdeen job and vowed to bring "identity and direction" to the club.
The 51-year-old Northern Irishman has ended his four-year St Mirren reign to become the Dons' new boss on a deal until summer 2029.
Robinson, who takes assistant Brian Kerr with him to Pittodrie, told the Pittodrie club's website: "When this opportunity arose, there was no way I could turn it down.
"Aberdeen has a tremendous history and there's no mistaking it is a huge club.
"The facilities and resources that will be at my disposal are excellent and more importantly, the fanbase is tremendous so I'm excited to work for a club of this size and strive to take it forward.
"I appreciate it has been a tough period for everyone, but players respond to positivity so we've got to stick together going forward.
"We will put a team out on the pitch to get the points we need to finish this season as strongly as we can.
"Aberdeen have clear ambition but it needs an identity, it needs direction and I aim to give the club that so we need everyone to get behind myself, the staff and the players."
