This has been a curiosity of mine for quite some time. as many know in grant's time there was no recognition of autism. although it's easy to associate behaviors with a condition, grant, at least on the surface, seems to have exhibited some traits that could coincide with mild autism. Stern, expressionless staring, shyness in public and public speaking, photographic memory of terrain, strategic thinking, aversion to music, Imperturbability in desperate situations, ability to clearly write from memory in a short period of time (ie memoirs) and under duress. There are of course many traits that seem to point otherwise such as his ability to display empathy and tenderness especially with family. although his empathetic response to death seems to be solidly controlled most of the time he was documented at having the occasional breakdown (ie wilderness). He was also averse to surgery and blood and reportedly obsessive about his meat preparation. Whether or not he had mild autism, grant would have had no other option in his time than to adapt and overcome to be functional.