Shawn Hartsock currently works on PNG-J, which is a pure Java re-implementation of the PNG libraries. He is also working on a QR plugin for Grails, which is publicly available for download into your Grails apps. Thirdly, Hartsock works on the audit logging plugin, which he has a user base around. He discusses these three projects in detail.
Shawn Hartsock works with the SaaS Tempo framework, which offers data capture services and clinical study management services to organizations that are trying to submit items for FDA (Food and Drug Administration) approval. At Clinipace, Hartsock creates Domain Specific Languages for researchers.