The ®rst Maudsley Monograph that Isaac Marks wrote used what I
had always thought an unpromising instrument ± Osgood's semantic
differential ± to amazingly good effect. It illuminated important points
about both obsessional illness and psychopathic personality. I read it
during my training, during which time he worked closely with Michael
Gelder developing behaviour therapy and familiarizing psychiatrists with
its use.
Although he is not an epidemiologist, Isaac has always appreciated the
enormous gulf between the disorders seen in the clinic and those occurring
in the community, and has grappled with the problem of how treatment can
possibly be made available on a wide enough scale.