welcome to the personal website of

Roy
Mariathas.

mbbs fracgp

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00 // about

the story.

family man, physician, founder.

thirteen years in medicine, seven as a family physician focused on patient experience. three years ago, stumbled upon digital health / tech / entrepreneurship as a prescriber at eucalyptus and through australia's inaugural clinical entrepreneur program. fell in love with startups.

then chatgpt landed. made a leap from bricks and mortar medicine, with not much of a plan and went all in on building. first a chronic disease workflow automation, then pivoted to an ai receptionist. real world mba, initiation by fire. along the way, worked with openai as one of 262 physicians on healthbench, and the only australian clinician on the team.

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01 // writing

essays & ideas.

long-form thinking on ai, healthcare, startups, faith and family.

healthcare-ai

doctors disagree with each other more than you think

we analysed 60,896 physician judgments grading ai medical outputs. doctors disagreed 22.5% of the time, and most of that disagreement was unexplainable.

mar 2026

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02 // research

research outputs.

going deep on the things that matter.

paper

decomposing physician disagreement in healthbench

original research investigating why physicians disagree when evaluating medical ai outputs. 81.8% of disagreement is unexplained by observable features — but closing information gaps could cut it significantly.

feb 2026

paper

healthbench: evaluating llms towards improved human health

contributing physician to openai's open-source benchmark for evaluating llm performance and safety in healthcare. 262 physicians, 5,000 multi-turn conversations, 48,562 rubric criteria.

may 2025

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03 // builds

selected work.

skin in the game. past and present.

healthcare

reggie 2.0 — voice ai receptionist

co-founder. voice ai to answer every call, book every appointment, and staff the front desk of australian general practice.

archived