I don't know anything from him (or her) except that he bought a lot of Lucanus from Drury's collection. The name is put in front of a lot of 18 Lucanus in the catalogue sales as purchaser. Then it must be probably at the beginning of 19th century.
Segelken is a German name.
The aim is to find lucanid types described by Swederus in the Drury's collection, especially those of Lucanus bubalus (actually Nigidius), others described together were tanrandus (actually Mesotopus) and antilope (acually Prosopocoilus). (It is not in the MacLeay collection nor in the Hunterian collection nor in NHM London or Paris collection)