[citation needed] Siddall was hired as an assistant curator at the American Museum of Natural History in July, 1999[3] and worked there as a curator until September, 2020, when he was terminated for allegedly having violated the museum's policy prohibiting sexual relationships between staff and mentees.
[9] Siddall has worked and published on parasitic and other animals, including leeches,[10] jellyfish,[11] guinea worms,[12] and bed bugs.
[1] An outside law firm representing the museum's interests found that Siddall had "engaged in verbal, written, and physical conduct of a sexual nature that had the effect of unreasonably interfering with your academic performance.
"[1] Siddall denied that any sexual encounter ever took place, and claimed he was fired because "he had found a serious error" in a paper.
[10] Siddall has been described as "a staunch supporter of parsimony and a harsh critic of maximum likelihood approaches”, although "having mellowed a bit on that".