Lefschetz pencils and finitely presented groups

In this paper, given a finitely presented group $\mathrm{\Gamma }$, we provide the explicit monodromy of a Lefschetz fibration with $(-1)$-sections whose total space has fundamental group $\mathrm{\Gamma }$ by applying “twisted substitutions” to that of the Lefschetz fibration constructed by Cadavid and independently Korkmaz. Consequently, we obtain an upper bound for the minimum $g$ such that there exists a genus-$g$ Lefschetz pencil on a smooth 4-manifold whose fundamental group is isomorphic to $\mathrm{\Gamma }$.