An overview is given on the first example of well-controlled block copolymerization of 1-olefins with methyl methacrylate (MMA) or ε-caprolactone using unique dual catalytic function of organolanthanide complexes toward both polymerizations of polar and nonpolar monomers using bridged Me2Si(C5R4)2LnR type complexes. These initiators are highly active by themselves for the copolymerization without the presence of any cocatalyst such as MAO or borate derivatives.