Werner Von Croy is a renowned archaeologist and a character in The Last Revelation, Tomb Raider Chronicles and The Angel of Darkness. He also is Lara's former mentor.
When Lara was 16, Werner brought her to Angkor Wat, Cambodia for her first adventure. This was in the first two levels of The Last Revelation. Werner wanted to collect the Iris, but in the process he hurt his leg. Since then he had been using a Jackal Walking Stick.
Later in her life Lara stole the Iris, which they got in Cambodia, from him. She infiltrated VCI Headquarters and escaped with the Iris in Tomb Raider Chronicles. Their next meeting was in Egypt when both were trying to get the Amulet of Horus. Even after Lara got the Amulet the chase continued and both parties went searching for the Armour of Horus in The Last Revelation. During this adventure Von Croy gradually became to be possessed by Set but was no longer possessed at the end of the game and tried to save Lara from the collapsing Temple of Horus.
In The Angel of Darkness we learn that Werner was murdered in Paris by the Cabal, or more accurately by Pieter Van Eckhardt but was kileed before he could contact Lara.