Stoltz. After several small jobs, Krop worked with Joop van Lunteren and AntonRädecker as an assistant in the studio of Hendrik van den Eijnde, 1913 – 1916
Ben Kamp. Van den Eijnde led the sculptor's studio with Hildo Krop, AntonRädecker [nl] and Joop van Lunteren [nl] on the sculpture decoration of the Scheepvaarthuis
painter girlfriend (and later wife) Jopie Goudriaan, and the sculptors Hanni Rädecker and Piet Damsté. Nicolaas Wijnberg [nl], writing in 1997, recalled that
Frederik Amalius van Oostveen, John Rädecker, Theo van Reijn, Jan Rotgans, John Ruys, Lizzy Schouten, Jo Schreve-IJzerman, Anton Smeerdijk, Kees Smout, Jacobus