Mariano Giaquinta (born Caltagirone, 1947), is an Italian mathematician mainly known for his contributions to the fields of calculus of variations and regularity theory of partial differential equation.
[3] Giaquinta is well known for his basic work in elliptic regularity theory, and especially in the setting of vectorial variational problems.
Together with Enrico Giusti he has obtained innovative results[4][5][6] on the regularity of minima of variational integrals and related singular sets.
His work with Giuseppe Modica on the local higher integrability properties of solutions to elliptic systems has had an influence on the development of partial regularity theory.
Giaquinta belongs to the ISI list of highly cited researchers in Mathematics [9] and he is a member of the German Academy of Sciences.