It does not appear to be a "guy".
"Dylan Davis (@JennaMagius) is a senior security analyst at RiskSense. He has performed a variety of Fortune 500 incident response engagements, discovered new CVEs in major software, and performed vulnerability analysis on a wide variety of embedded devices."
I was just going off the name and the fact that their (Github, I think?) bio described them as a "girl".
> 1 a : man, fellow
> b : person —used in plural to refer to the members of a group regardless of sex
> saw her and the rest of the guys