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Ayende Rahien (aka Oren Eini)

Oren Eini has over 15 years of experience in the development world with a strong focus on the Microsoft and .NET ecosystem. And has been awarded the Microsoft’s Most Valuable Professional since 2007.

An internationally known presenter, Oren has spoken at conferences such as DevTeach, JAOO, QCon, Oredev, NDC, Yow! and Progressive.NET.

Oren is the author of the book “DSLs in Boo: Domain Specific Languages in .NET”, published by Manning (

Oren’s main focus is on architecture and best practices that promote quality software and zero-friction development.

Oren, using his pseudonym as Ayende Rahien, is a frequent blogger at

Oren Eini is the founder of Hibernating Rhinos LTD, a Israeli based company, offering:

  • Consulting and mentoring services
  • Code reviews
  • Architectural reviews and system design
  • developer productivity tools for OLTP applications such as:
    • NHibernate Profiler (
    • Linq to SQL Profiler(
    • Entity Framework Profiler (
    • LLBLGen Profiler (
    • No SQL solutions
    • RavenDB – a native .NET second generation document database (
    • RavenMD – a native .NET distributed queuing and messaging system (soon to be released

Oren is the author of Rhino Mocks, one of the most popular mocking frameworks on the .NET platform, and is also a leading figure in other well known open source projects including:

  • NHibernate
  • RavenDB
  • Rhino Tools Suite
    • Rhino Mocks – mocking framework
    • Rhino Commons – infrastructure framework
    • Rhino Igloo – MVC framework for WebForms
    • Rhino Security – security infrastructure for NHibernate
    • Rhino DSL – Domain Specific Language building toolkit
    • Rhino ESB – Distributed Service Bus framework
    • Rhino Licensing – licensing infrastructure
    • Rhino ETL – Extract / Transform / Load framework
    • Rhino PHT – Persistent Hash Table for .NET
    • Rhino DHT – Distributed Hash Table for .NET
    • Rhino Queues – Distributed queuing infrastructure
  • Castle project

His hobbies include reading fantasy novels, reviewing code, and writing about himself in the third person.

Web site: blog