The domain of my dissertation was Mixed Reality applied to Pervasive Games. The future work section of my dissertation points to the Internet of Things, the Metaverse and by extension Cyber Physical Systems. My current domain of research (applied to the Metaverse) can be more clearly stated as System of Systems Integration (SoSI), with the systems being Massive Multiuser Virtual Environments.
Prior to attaining my Ph.D., I worked as a professional software development with the majority of works being related to the medical field. After encountering MUD around 1995, my primary interest has always been virtual worlds; unfortunately, my commissions haven't been in that area.
In spirit with research, many commissions have been prototyping or feasibility testing, rather than building and maintaining a long standing product.