Exclusive to: 
“How are you still alive?”
–Wilson
“A lot of old stuff in here.”
–Willow
“You have old things for Wolfgang?”
–Wolfgang
“You'll be seeing Abigail soon.”
–Wendy
“OUTMODED SELLER OF OBSOLETE TECHNOLOGY”
–WX-78
“I better hurry this up, he looks like he could drop at any time.”
–Maxwell
“Appears educated, but reluctant to answer any of my many questions.”
–Wagstaff
“Dö thöust have anything fröm the öld cöuntry?”
–Wigfrid
“Mom told me always to respect my elders.”
–Webber
“Whoa, dude. You are old.”
–Walani
“You look like you've enjoyed many a fine meal.”
–Warly
“Arr, yer a grizzled one, ain't ye.”
–Woodlegs
“HATH SMACK OF AGE IN HIM”
–Wilba
“Ah! Someone who appreciates all my archeological finds.”
–Wheeler
The Professor is a Pig Trader Mob exclusive to the Hamlet DLC. He is an elderly pig that buys relics for a Tenpiece Oinc, with no limit to the amount of trades in a day. He can be found at the Academy (signified by a triangle in a circle on the Map) in the Pig Village.
Behavior
One Professor may spawn from a Town House, and will wander randomly around their house and eat any edible items left on the ground, including Pig Skin. Every so often they will drop one Manure where they are standing, and if the player picks up that manure the Professor will approach them and give them one Oinc, along with an accompanying Quote.
Whenever there is a hostile mob nearby, or a player targets them or another Pig Trader or Royal Guard near them, they will enter a panicked state. They will begin to move around semi-randomly in a direction away from the aggressor.
They will attempt to return to their house in the evening, and if they cannot reach their house or their house is destroyed they will seek the nearest light source and stand next to it until night, when they will sleep on the ground.