Dr. Marcel Davidoff is the head of Lyle House, a scientist who oversees all patients and reports on their progress from time to time. He helps capture Chloe and Rae, and is shown to have influence over what the doctors can and cannot do.
Dr. Davidoff is also head doctor and leading member of Project Genesis. He appears to be quite friendly and caring though he shows a particular affection for Rae. Chloe discovers that the password on his computer is Rae's birth mother's name, Jacinda, and there are hints that he may have been romantically involved with her.
He dies at the end of The Reckoning from being shot by Diane Enright, who was controlled by Chloe Saunders.
"The worst is when Dr. Davidoff comes to town. I hate Dr. Davidoff. We all do. He's creepy, with cold hands and awkward, lame jokes. But he's the St. Cloud's top doctor, so every year, he brings a team to visit the lab. And, since they have world-class doctors on hand, it's time for every kid to get a complete physical. Oh joy." -Maya Delaney