Dr Vinderman is a character in Fortnite: Save The World. He is the owner and founder of Vindertech, the creator of Ray, and the designer of the Storm Shield and multiple other storm-prevention devices.
In the quest I'm Probably Dead in Plankerton, Ray brings you to a Vindertech Lab to search for Dr Vinderman. Upon completing the quest, a tape plays with Dr Vindermans voice saying "If you're hearing this, I'm probably dead." He goes on to say that the player should continue fighting on, as referenced in the next mission, "Fight On.". Later in Canny Valley in the mission "V" you have to build a memorial for Dr.Vinderman in the shape of a giant V, after completing the build, Ray says her final goodbye to Dr.Vinderman. Later in Canny Valley act 2 you find out that Dr.Vinderman's AI is inside SEE-Bot, and his partner Desiree needs to take him back home. Later in Canny Valley Act 3 in the mission "Have you tried turning it on and off again?" You need to explore Vinderman's Mansion and extract his AI from SEE-Bot.