Which preposition to use with washburn

as Occurrences 1%

In the same period a smaller gang with John Washburn as its leading spirit and with Natchez as informal headquarters, was busy at burglary, highway and flatboat robbery, pocket picking and slave stealing.

at Occurrences 1%

In the evening your father gave his lecture at a little club-room, got up chiefly by Mr. and Mrs. Washburn at their own expense.

in Occurrences 1%

[Footnote 57: The manifold felonies of the gang were described by Washburn in a dying confession after his conviction for a murder at Cincinnati.

Which preposition to use with  washburn