Irwin D'Souza is an active contributor to the Eclipse OpenJ9 project . His primary expertise is in control logic and AOT where has done an excellent job of re-inventing and documenting the core infrastructure of AOT in the compiler component of Eclipse OpenJ9 project.
In his more recent and technically challenging piece of work Irwin has led the re-design and development of a new AOT run time assumptions infrastructure in the JIT compiler by introducing the Symbol Validation Manager . This substantial piece of work has opened the doors to higher performance AOT code giving us the necessary push to enable shared classes by default in the Eclipse OpenJ9 0.12.0 release. As a direct result of Irwin's work we have seen performance improvements of AOT compiled code by up to 15% which enables Eclipse OpenJ9 to continue its dominance in startup time metrics over its competitors.
Along the way Irwin has written an excellent set of blog posts on how the various parts of the AOT infrastructure, including relocation and validation of AOT code . However this is not Irwin's first contribution to documenting the technical details of the Eclipse OpenJ9 project. He has been involved in Eclipse OpenJ9's exploitation and documentation of hardware assisted Concurrent Scavenge  and he is a regular contributor to very detailed compiler control documents written in the projects GitHub repository .
Since the inception of the Eclipse OpenJ9 project Irwin has contributed a total of 30 pull requests totaling to 46 distinct commits . These numbers do not tell the full story as the area of the JVM Irwin typically works in requires a high degree of expertise and careful engineering which is reflected in his high contribution ratio (11,798 ++ 2,155 --). Irwin is frequently found in other control related PRs providing constructive code reviews and suggestions to other contributors. When his expertise is explicitly sought by other contributors for a code review, his reviews are timely and thorough. He can be frequently found in the Eclipse OpenJ9 Slack workspace providing input to conversations at hand. Irwin has publicly presented some of his work at conferences such as CASCON thereby driving interest into the Eclipse OpenJ9 project.
Among all Irwin has time and time again proved on various issues and pull requests that his values and goals align with that of the Eclipse OpenJ9 project. His judgment and expertise in the area of control and AOT are well respected among the broader project community. He is a strong advocate for documentation and is vocal about the strengths and innovation of the Eclipse OpenJ9 project to the open source community.
With Irwin's past and current track record and all the above qualities I believe Irwin will make an excellent committer to the Eclipse OpenJ9 project.