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Spencer Mateega

Founder

Machine learning

Now Co-founder and CEO · AfterQuery

@spencermateegamateega.com ↗

Co-founder and CEO of AfterQuery, an applied research lab that builds training data for frontier models: expert reasoning traces, RL prompts with rubrics, agent environments and computer-use trajectories. Studied at Wharton and Penn.

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  1. AfterQueryCo-founder and CEO

Sourcesmateega.comEducation and jobs are read from their own homepage or employer's page; papers checked on arXiv. From LinkedIn only the person's own public posts are read; GitHub is a link only.

Account links back to x.com/spencermateega · Avatar from their X account, taken 2026-11-02

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