Gregor is a widely recognized thought leader on asynchronous messaging and service-oriented architectures. He co-authored the seminal book "Enterprise Integration Patterns" (Addison-Wesley, 2004), followed by "Integration Patterns" and "Enterprise Solution Patterns", both published by Microsoft Press. He was nominated a Microsoft MVP (Most Valuable Professional) Solution Architect for his contributions to the developer community and recognized as an active member of the patterns community by the Hillside Group. In 2005, Joel Spolsky selected Gregor's article "Starbucks Does Not Use Two-phase Commit" for his "Best Software Writing" (APress).