Portrait of Ryan Castellucci in 16 bit era ‘pixel art’ style


I’m a professional computer security researcher with an extensive background in Linux systems administration, computer networking, applied cryptography, and programming. Since childhood I’ve enjoyed taking things apart and learning how they really work. Deep understanding allows me to push the boundaries of what is possible. Originally from California, I now live in London.

My current job is with Human Security (formerly known as White Ops), fighting the proliferation of malevolent bots through the magic of implementation-defined behavior and full stack forensics.

If you’re writing about me or my work, please use gender neutral language to refer to me. I use they/them pronouns and prefer not to use a title, though “Mx.” is acceptable where one is required.

My family name is pronounced “kas-teh-LOO-chee”.