I have worked with Erik on two Magento releases. He provided developer-oriented documentation for the responsive web design features he built so I could include them in Magento product documentation. Erik writes very well and more importantly, he is very prompt and responsive. He obviously cares about customers a great deal and has helped Magento provide excellent documentation to them. Erik’s hard work and dedication (and particularly his customer focus) set him apart in my experience with most other developers I’ve worked with.