Phil is a Senior Technical Staff Member in the office of the CTO of IBM Cloud. Phil is a core contributor and maintainer on the Docker engine project where he has contributed key features like user namespace support and multi-platform image capabilities. Phil is also a founding maintainer of the CNCF containerd project, and participates in the Open Container Initiative (OCI) as a contributor to the development of runc.

Phil speaks regularly at industry conferences and meetups and enjoys helping customers and developers alike understand the every-growing container ecosystem. Phil is a member of the Docker Captains program and maintains an active blog on container topics at You can find him on Twitter tweeting away as @estesp.