Can you pass an IEnumerable<Type> and retrieve the Type?

Question

I have some classes that use inheritance as in
Teacher : Person : Entity : BaseObject
Student : Person : Entity :BaseObject
Company : Entity : BaseObject etc.

The base object has an abstract IEnumerable property called Hierarchy
Entity class implements Hierarchy as new List<Type>() { typeof(Entity) };
Person class implements Hierarchy as new List<Type> { typeof(Person), typeof(Entity)}; etc.

In my db.Save method I am trying to cast the object to each of these types in turn so I can call the correct stored procedure.

        public static void SaveObject(BaseObject obj)
    {
        foreach (var type in obj.Hierarchy) //obj.Hierarchy is   IEnumerable<Type>
        {
            Object o = obj as type;
            //.....
        }
    }

but I get an error 'type is a variable but is used like a type'. Is there any way I can cast my child object to one of its parent types along these lines?