Large-Scale Calculations of Single-Particle Properties

We review recent large-scale calculations of single-particle energies and spectroscopic factors around closed shell nuclei in the {\em sd} and {\em pf} regions. Emphasis will be put on the following results: \begin{itemize} \item The self-consistent Green's functions method employed in the calculations reproduces the benchmark results for the binding energy of $^{4}$He with good accuracy. Ab-initio calculations have now been performed up to $^{56}$Ni. \item Preliminary studies of spectroscopic factors, based on the chiral N3LO force, exhibit an asymmetry dependence similar to that observed in heavy-ion knockout experiments but weaker in magnitude. \end{itemize}