Harriet's journey began at Deloitte Australia, where she specialised in Defence portfolio projects as a Senior Consultant. Her career also spans roles as a Data Scientist at the University of Sydney and as Senior Delivery Lead at a tech education start-up in New York City. She returned to Canberra to work for the Australian Government, where she served at the intersection of data science, cyber security, and national security, eventually becoming an acting Tech Director.

She holds a degree in Physics and Bio-anthropology, along with a Master's in Cyber Security. In 2021 she commenced a PhD in Machine Learning Security. This is where she encountered AI Security and adversarial machine learning for the first time.

Harriet founded Mileva Security Labs, driven by her mission to raise awareness about AI system vulnerabilities and provide solutions to secure them. Her work ensures that organisations are equipped to defend against threats and protect their AI systems from disruption and compromise.