About
Isaacus is a foundational legal AI research and development company.
We build legal AI models for legal tech firms that help them ship smarter products, faster.
Our core offering includes a soon-to-be-released state-of-the-art legal embedding model as well as the world’s first legal grounding API, in addition to our already-in-use lightweight legal classification and text extraction models.
We’re also proud supporters of open legal data and software, maintaining the Open Australian Legal Corpus, the only open database of Australian law, as well as semchunk, the world’s most popular semantic chunking library, downloaded over 700k times a month.
If you’re interested in partnering with us on the development of our AI models, or if you’d like to explore your own sovereign deployment of Isaacus models, you can reach out via our contact page. Members of the press can also consult our media kit to access our core brand assets.
Team
The Isaacus team, led by Umar Butler, an internationally recognized legal AI expert, combines advanced knowledge of AI and statistics with deep expertise in law and regulation, spanning 35 years of industry experience across three countries.
Umar Butler
Founder & CEO
Umar Butler, founder and CEO of Isaacus, is an expert in legal AI.
His most well-known works include the Open Australian Legal Corpus, the first open LLMs for Australian law, and semchunk.
Previously, Umar was the Assistant Director of Data Science at the Attorney-General’s Department, where he was responsible for overseeing all the Department’s national-level AI projects.
His formal qualifications are in law, holding a Bachelor of Laws (Honours) from La Trobe University.
Abdur-Rahman Butler
Founding Engineer
Abdur-Rahman Butler, a Founding Engineer at Isaacus, is an economist by education and data scientist by trade.
He has made substantial contributions to improving the legal-domain coverage of the Massive Text Embedding Benchmark (MTEB) through the addition of several new legal information retrieval datasets.
He completed a Master of Economics at Monash University in 2025, receiving the Dean’s Unit Prize for Applied Microeconomics upon graduating.
Anthony Butler
Founding Advisor
Anthony Butler, a Founding Advisor at Isaacus, is an expert in AI, fintech and cybersecurity.
He has served as Chief Technology Officer of IBM Middle East and Africa, an IBM Distinguished Engineer, and a Senior Advisor to the Saudi Central Bank.
Anthony is currently also Chief Architect of Humain, Saudi Arabia’s sovereign AI company, and an advisory board member of Chainlink and Rilian Technologies.
