0001036050-97-000122 DEF 14A 1 19970514 19970418 NASD SEI CORP 0000350894 6211 231707341 PA 1231 DEF 14A 34 000-10200 97583607 680 E SWEDESFORD RD WAYNE PA 19087-1658 6102541000 680 EAST SWEDESFORD ROAD WAYNE PA 19087 DEF 14A 1 000103605097000122-001-seq1-def-14a.txt DEFINITIVE NOTICE & PROXY