Through a program called Volatile Fungus Deportation, he grew Medusoid Mycelium in the Gorgonian Grotto, and studied its poison for use as a weapon against the enemies of V.F.D. Kit Snicket warned Gregor that if he continued his research, great danger would come to the facility. The poison's antidote is revealed to be horseradish, or its culinary equivalents (which include wasabi).
Despite working on the noble side of V.F.D., Gregor's plans for the Medusoid Mycelium cause the Baudelaires to question his loyalties. Fiona suggests that Gregor was volatile, just like the Mycelium.
Gregor Anwhistle was killed in the Anwhistle Aquatics fire, which, according to the Daily Punctilio, was set by Fernald.
The Grim Grotto also mentions that Gregor was an ichnologist, a person who studies footprints.
In The Grim Grotto, Fiona tells the Baudelaires that Gregor and Ike worked together at Anwhistle Aquatics and that Ike tried to prevent Gregor experimenting the Medusoid Mycelium and that after Gregor refused to what Ike said. After that, they never spoke to each other again.
|Grandparents||Grandparents (unknown if adoptive or biological)|
|Unknown to which Anwhistle parent||Parents||Unnamed Guardians||Biological Parents †||Unknown||Unknown|
|Unnamed Mother †||Unknown||Beatrice Baudelaire †||Bertrand Baudelaire †||Bertrand's Cousin||Monty Montgomery's sister||Monty Montgomery †|
|Gregor Anwhistle †||Ike Anwhistle †||Josephine Anwhistle †||Violet Baudelaire||Klaus Baudelaire||Sunny Baudelaire|
|Beatrice Baudelaire II|