There are some basic guidelines that have been followed in the NAF from the beginning. A name is generally established based on the work being cataloged, and if the name is unique, no further research is required to establish birth dates or other information.
Martin Jacques was established over 30 years ago when his first work was cataloged at the Library of Congress. This is his authority record: http://lccn.loc.gov/n82032754
In those days, only fairly minimal information was recorded. However, as far as I know, it has always been the policy to include a birth date if it is available at the time the heading is established. So we can assume it was not available to the cataloger at the time. If a birth date becomes available later, it can be added as information to the NAR, but it is not added to the authorized access point unless necessary to break a conflict. It is perfectly acceptable to have an access point that consists of just a surname and a forename, even if it doesn’t feel satisfying. J
It is fairly certain that the person on that NAR is the one born in 1945 because examining the bibliographic record for the work originally cataloged shows it to be published by the Communist Party of Great Britain, with which Jacques was active (http://en.wikipedia.org/wiki/Martin_Jacques)
VIAF consists of records from many national libraries and some had access to his birth date and included it in their authority records. When we reach the promised land of linked data we may be able to create displays that take data from different sources and present customizable name forms to our users, but for now, PCC libraries have to use the access points in the NAF.
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