Triblock copolymers of polystyrene (PS) and polyolefin (PO), e.g., PS-block-poly(ethylene-co-1-butene)-block-PS (SEBS), are attractive materials for use as thermoplastic elastomers, and are produced commercially by a two-step process, which involves the costly hydrogenation of PS-block-polybutadiene-block-PS. I will present a one-pot strategy for attaching PS chains to both ends of PO chains to construct PS-block-PO-block-PS directly from olefin and styrene monomers (Scheme a). A practical and simple method for the preparation of ABA-type olefin triblock copolymers, e.g., PE-b-poly(ethylene-co-propylene)-b-PE will be presented. been described (Scheme b). The original Sasol catalytic system for ethylene tetramerization is composed of a Cr source, a PNP ligand, and MAO (methylaluminoxane). The use of expensive MAO in excess has been a critical concern in commercial operation. An extremely active catalytic system that avoids the use of MAO will be presented.