ated ▁for ▁the ▁form ulation ▁of ▁spl ine ▁functions ▁in ▁terms ▁of ▁the ▁basis ▁spl ines , ▁or ▁B - spl ines ▁developed ▁by ▁Sch o enberg ▁and ▁Cur ry . ▁He ▁was ▁a ▁teacher , ▁gu iding ▁numerous ▁gradu ate ▁students . ▁He ▁is ▁the ▁author ▁of ▁a ▁number ▁of ▁works , ▁including ▁an ▁intro duct ory ▁text book ▁on ▁numerical ▁analysis ▁( with ▁S . D . ▁Con te ) ▁and ▁a ▁text book ▁on ▁spl ine ▁approximation . ▁Carl ▁has ▁also ▁worked ▁with ▁M AT LAB ▁extens ively ▁over ▁the ▁years ▁and ▁is ▁the ▁author ▁of ▁the ▁S pl ine ▁Tool box . ▁ ▁Carl ▁de ▁Bo or ▁retired ▁from ▁the ▁University ▁of ▁Wisconsin – Mad ison ▁in ▁ 2 0 0 3 ▁and ▁re located ▁to ▁the ▁Pacific ▁North west , ▁where ▁he ▁continues ▁to ▁work ▁with ▁colle agues ▁on ▁mathematical ▁problems , ▁and ▁to ▁travel . ▁ ▁He ▁currently ▁lives ▁on ▁Or cas ▁Island , ▁in ▁Washington ▁state , ▁with ▁his ▁second ▁wife , ▁Helen ▁Be e , ▁author ▁of ▁numerous ▁texts ▁in ▁human ▁development , ▁to ▁whom ▁he ▁has ▁been ▁married ▁since ▁ 1 9 9 1 . ▁ ▁In ▁addition ▁to ▁his ▁emer it us ▁status ▁at ▁the ▁University ▁of ▁Wisconsin – Mad ison , ▁he ▁is ▁also ▁an ▁affili ated ▁professor ▁at ▁the ▁University ▁of ▁Washington . ▁ ▁de ▁Bo or ▁has ▁been ▁listed ▁as ▁an ▁I SI ▁High ly ▁C ited ▁Author ▁in ▁Mathemat ics ▁by ▁the ▁I SI ▁Web ▁of ▁Know ledge ,