Old Harry said that if Sam and me had been facing the Real Teachers Pet, once we actually pointed our guns at him, or once he fell to the ground, both of use would have been killed instantly, before we were even aware that we were being fired on.
He said those were the direct orders hed received from the Teacher. Yet despite having saved the teachers child and being the "teachers pet" would not save Hall if he inadvertently hurt a child in the teachers project as evidenced by a mother talking to her Tall White son in front of Hall:"Alright", replied his mother, "You may join the teachers pet project. Do not get too close to him, and remember, if anything ever goes wrong, if Charlie ever touches you, I will ask your uncle Harry to kill him (vol 1, p.449).
My conclusion is that the Tall Whites are closely associated with the Tall Grays from Orion.
Furthermore, these most likely come from Rigel, Orion which was a former Nordic world taken over by the Grays. This accounts for the Tall Whites Nordic features that Hall describes, and their Gray/Reptilian characteristics such as 4 digit hands with two inch claws rather than nails.
"The Grays began to visit us, first a few as ambassadors, then as specialists in various domains where their expertise could be useful to us, as participants in different programs that involved mutual collaboration, and finally as tourists.