Harry Houdini was a very prominent man during and after his passing. His passing being one of great interest because of his feats in proving or otherwise the one great thing that none of us escape.
With the sad decline in the standards of mediumship the most important aspect is how good is a development teacher. This all important aspect cannot be emphasised enough. Not all great mediums make good teachers. Not all good teachers are great mediums. It is not good enough to study aspects of mediumship, throw that together with a few years experience and decide that you are able to teach to a sufficient level. Having knowledge and being able to pass it on are not necessarily the same thing.