Dr. Klatskin actually did his research at Yale Hospital in the 1940's- 1960's, he identified the tumor and also performed the liver biopsy in the late 1930's. He died in the mid 1980's.
Ironically one of their liver teams ( group of doctors) at Yale is called the "Klatskin team". Prior to my mom being diagnosed with CC, she was told she had PSC. while she was hospitalized I went to visit her and as I approached the room I saw " Klatskin Team" written on her door. Without her seeing me I turned around and broke down. I had already researched worst case and knew exactly what a Klatskin tumor was. I went over to the nurse and basically told her how upset I was adn their nerve to diagnose my mom with this tumor without even telling us!!!! She was young and by the look on her face had no idea what I was talking about or who Klatskin even was ( and maybe had never even heard of this cancer). To make a long story short, this liver team was named after him only because he taught there, not because she had a Klatskin tumor.. I found this out the next day.. never even knowing he was from our area in connecticut..
Ironically a month later, she was diagnosed with this tumor anyway.. go figure!