Mae gan Mr Elias ddiddordeb arbennig mewn gweithio amlasiantaeth a'r canlyniadau y mae modd eu cyflawni, ac mae wedi ymgymryd â sawl prosiect a sawl adolygiad cenedlaethol a lleol o wasanaethau yn y maes gwaith hwn.  Bu hefyd yn cynghori’r Llywodraeth ac yn arwain yr adolygiad cenedlaethol o Ddull Gweithredu’r Rhaglen Ofal ym maes Iechyd Meddwl. Dylanwadodd canlyniadau’r adolygiad hwnnw ar ddull gweithredu’r Mesur Iechyd Meddwl.
Mr Elias has a particular interest in multiagency working and the outcomes that can be achieved and has undertaken several projects and national and local service reviews in this area of work.  He also advised Government and jointly led the national review of the Mental Health Care Programme Approach, the findings of which influenced the implementation of the Mental Health Measure.