Extensive experience imaging (CCD and photographic), ultra-deep imaging (CCD on 6m to 10m telescopes), in photometry (visible and IR photo-electric and CCD), spectroscopy (long slit) of a broad range of moving and non-moving objects (comets, asteroids, planets, galaxies, quasars including gravitational lenses, extremely faint objects as very distant comets and spacecrafts...), on many ESO (Chile), MKO (Hawaii, USA) and BTA (Zelentchukskaja, CEI), gathered during 15+ years as resident astronomer of major observatories.