derrick@work

I lead applied AI for Codex in APAC and back early-stage AI companies.

Today I lead applied AI for OpenAI's Codex in APAC, based in Singapore. Before OpenAI, I led enterprise work at Scale AI, cofounded Bild, and worked in product and engineering at Amazon and Apple. I also invest in early-stage AI companies and photograph landscapes, wildlife, and people around the world.

Explore my career Read my investing thesis

Working index

Build, back, and frame.

Career

From secure systems at Apple to applied AI at OpenAI.

Build

Investing

Backing AI companies solving hard, specific problems.

Back

Photography

Landscapes and life from every angle.

Frame

Featured writing

Building with Codex and agents.

All writing & talks

The Codex agent loop connecting support, engineering, operations, and security workflows.

OpenAI DevelopersAugust 19, 2026

Codex as a platform: build on the open agent harness

A guide to using Codex’s open agent harness, codex exec, the SDK, and app-server to bring full agent workflows into the products, interfaces, and operational systems people already use.

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Constellations forming a cloud, connected nodes, a terminal window, and chat bubbles against a starry sky.

XSeptember 11, 2026

ChatGPT, Codex, APIs, and agents: how it all fits together

A practical guide to how ChatGPT, Codex, the Responses API, Agents SDK, and Agents API fit together, with examples showing who runs the agent, where it works, and what developers control.

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The throughline

The work I like sits between technical possibility and practical use.

At Apple that meant cryptography and security. At Scale AI and OpenAI, it means helping companies deploy AI. In photography, it means deciding what belongs in the frame.