tanenbaum is currently chairman and chief executive officer of kilmer van nostrand co. limited, having served as president and ceo from 1968 to 2000. under his direction, kilmer developed into a multi-faceted civil engineering construction company whose operating divisions and subsidiaries covered road building and paving, ready-mix concrete, aggregates, heavy construction, trucking and pipe manufacturing. the heavy construction operations included projects in canada, the united states and south america and specialized in constructing subways, elevated transit system guideways, bridges and tunnels including the design-build of the toronto zoo elevated transit system, the elevated transit system in miami and subways in caracas, atlanta, calgary and toronto. in 1984 this unit was merged with canadian foundation company ltd. which itself was later merged with bannister international. from that time through december 2000 kilmer's road building, paving and aggregates operations were conducted through kilmer's wholly owned subsidiary, the warren paving & materials group limited.