Background: 
Master ("laurea"), University of Roma "La
Sapienza"
(1981)
May 1981 May 1982 served as fireman (military service)
Ph. D., Courant Institute, NYU (19821985)
Post doc:
University of Arizona, ETH (Zürich), École Polytechnique (Palaiseau)

Current position: 
Full Professor in Mathematical Analisys, Math. Dept., University of Roma Tre (since 2002)

Main scientific interests: 
Nonlinear differential equations and dynamical systems with
emphasis on stability problems in Hamiltonian systems

Selected scientific achievements: 
Classical Hamiltonian systems and Celestial Mechanics:
Whitney smooth interpolation theorem for maximal Lagrangian tori in nearlyintegrable Hamiltonian systems
Stability estimates in KAM theory (also computer assisted)
Analytic properties of invariant tori at the breakdown threshold
Arnold diffusion (general theory for a priori unstable systems; variational estimates on diffusion speeds)
Direct proof of convergence of Lindstedt series and direct proof of Kolmogorov's theorem on
persistence of invariant tori (via graph theory)
Extension of Moser's smooth KAM theory to lower dimensional elliptic tori
Existence of invariant tori in physical "submodels" of the Solar system (computerassisted)
Dissipative KAM theory for the spinorbit problem
Completion and extension of Arnold's project on the existence of invariant tori for the planetary Nbody problem
"Optimal" stability exponents for Nekhoroshev's Theorem in the general steep case
KAM theory for secondary tori and optimal measure estimates for KAM tori
One dimensional Schrödinger operators:
Spectral theory of quasiperiodic perturbations of periodic Schrödinger operators
Aysmptotic estimates on eigenfunctions
Infinite dimensional Hamiltonian systems and PDEs:
Almost periodic solutions for infinite dimensional systems of interacting particles
KAM quasiperiodic solutions for nonlinear wave equations with periodic BC

Editorial Board: 

Other: 
 Invited speaker
ICM Seoul 2014
(Section 9: Dynamical Systems and Ordinary Differential Equations)
 Prix 1995 Institut Henri Poincaré (first edition)
 the papers
Drift and diffusion in phase space
and
A direct proof of a theorem by Kolmogorov in Hamiltonian systems
have been selected by the AMS for the volume "FEATURED REVIEWS in Math Rev 199596. Reviews of
Outstanding Recent Books and
Papers, American Mathematical Society 1997".

Director of the local unit ROMA TRE for the COFIN projects (MURST/
MIUR)
Variational methods and nonlinear differential equations:
(A. Ambrosetti, PI)
19981999, 20002001, 20022003, 20042005, 20062007
Director of the local unit ROMA TRE for the ( MIUR) "PRIN" projects:
Critical Point Theory and Perturbative Methods for Nonlinear Differential Equations (S. Terracini, PI)
"PRIN2009" (20102011)
Variational and perturbative aspects of nonlinear differential problems (S. Terracini, PI)
"PRIN2012" (20142016)
Topological, variational and perturbative techniques in dynamics of PDEs and ODEs (A. Malchiodi, PI)
"PRIN2015" (20172019)

Member of the scientific committee for the conferences (last five years):
Dynamics, topology and computations (Bedlewo, Poland, June 18  23, 2018)
Global dynamics in Hamiltonian systems
(Girona, Spain, 28 June  4 July 2015)
Dynamics, Topology and Computations
(Bedlewo, Poland, June 15  20, 2015)
 Invited lecturer in about 100 international conferences
 Director of
Graduate Studies
of the PhD School in Mathematics, Roma Tre (Nov. 1, 2010  March 2017)
 Board member of SIMCA
(Società Italiana di Meccanica
Celeste)
 The mainbelt asteroid
114829 Chierchia  2003 OC21 (discovered 2003 July 23 by the Campo Imperatore Near Earth
Object Survey)
has been given his name.
