Apple developer documentation
Sample code and articles
Analyzing audio performance with Instruments
AudioToolbox
Preparing an educational assessment app for distribution
Automatic Assessment Configuration
Work
Work since 2009.
Apps, hardware, AI assistants, Apple documentation and books. Client names appear where the work is already public.
Now · 2024–2026
Current work
MyRunBook Planner
Planner for tasks, feeds, meeting transcripts and receipts, with on-device OCR and a local LLM.
SwiftUI · MLX
Hospital vendor badge app
Hospital vendor check-in with geofencing, polygon detection and a Bluetooth LED badge.
Swift · CoreBluetooth
Log analytics and troubleshooting assistants
Internal and customer-facing chat over app logs, with Claude or a local model behind each answer.
Claude · llama.cpp
AstroStorm
Camera control and image stacking for night-sky and lightning photography.
Skills Organizer
A Mac app for browsing and launching Claude Code skills.
SwiftUI
IoT
Connected hardware
Bluetooth · iOS
IoT connected smart badge
A wearable badge that lights up to show a vendor's hospital access status, driven by the iPhone app over Bluetooth.
Energy · embedded
SOLARable energy monitor
A home energy monitor whose light ring shows at a glance whether solar panels are producing more power than the house is using.
Books · Apress
For Absolute Beginners series
Objective-C for Absolute Beginners
iPhone, iPad and Mac programming, several editions. With Brad Lees and Mitch Fisher; Stefan Kaczmarek joined later editions.
Swift 2, Swift 3 and Swift 4 for Absolute Beginners
With Brad Lees; Stefan Kaczmarek joined for Swift 4.
Client apps
