Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE – CONAHCyT, Mexico)

• 1998–1999: Cátedra Patrimonial Nivel II, Investigador Titular "A" (Invited Research Assistant Professor)

• 2000–2006: Investigador Titular "A" (Research Assistant Professor)

• 2006–2012: Investigador Titular "B" (Research Associate Professor)

• From 2012: Investigador Titular "C" (Tenured Research Professor)

Center for Astrophysics | Harvard & Smithsonian (Cambridge, MA, USA)

• 2022–2023: Fulbright Research Scholar

Instituto de Astronomía, Universidad Nacional Autónoma de México (IA-UNAM)

• 2004–2005: Associate Research Professor (on sabbatical leave from INAOE)

Special Astrophysical Observatory, Russian Academy of Sciences (SAO RAS)

• 1991–1993: Junior Researcher

• 1994–1995: Researcher

• 1996–1997: Senior Researcher

• 1995–1997: Lead Astronomer, SAO RAS 60 cm Telescope Modernization and Automation Project

Byurakan Astrophysical Observatory, Armenian Academy of Sciences

• 1986–1987: Assistant Astronomer

• 1988–1990: Postgraduate Student

• 1991–1993: Junior Researcher

• 1994–1995: Researcher

• 1996–1997: Senior Researcher

• 1989–1991: Head of the 1m Byurakan Schmidt Telescope Laboratory

Visiting Research Positions

• Mar–Apr 1996: Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE, Mexico)

• Mar–May 1997: INAOE, Mexico

• Oct–Nov 2002: Hamburger Sternwarte (Germany)

• Sep–Oct 2004: Max-Planck-Institut für Radioastronomie (Germany)

• Sep–Nov 2005: Max-Planck-Institut für Radioastronomie (Germany)

• Jul–Oct 2008: Max-Planck-Institut für Radioastronomie (Germany)

• May–Jun 2010: Max-Planck-Institut für Radioastronomie (Germany)

• Aug 2015: The University of Texas at San Antonio (USA)