Name	Known for
Eric Meyers Self - Narrator (voice) Self - Narrator (voice) See fewer	Snatch (2000)
Dave Grinspoon Self - Curator of Astrobiology (as Dr. David H. Grinspoon) Self - Curator of Astrobiology (as Dr. David H. Grinspoon) See fewer	Nova (1974)
Fran Bagenal Self - Professor (as Dr. Fran Bagenal) Self - Professor (as Dr. Fran Bagenal) See fewer	Nova (1974)
Ronald Greeley Self - Regents' Professor of Geology (as Dr. Ronald Greeley) Self - Regents' Professor of Geology (as Dr. Ronald Greeley) See fewer	Wildest Weather in the Solar System (2011)
Rosaly Lopes Self - Planetary Geologist (as Dr. Rosaly M.C. Lopes) Self - Planetary Geologist (as Dr. Rosaly M.C. Lopes) See fewer	Ancient Aliens (2009)
Kevin R. Grazier Self - Investigation Scientist (as Dr. Kevin R. Grazier) Self - Investigation Scientist (as Dr. Kevin R. Grazier) See fewer	Escape Room: Tournament of Champions (2021)
Heidi Hammel Self - Senior Research Scientist (as Dr. Heidi B. Hammel) Self - Senior Research Scientist (as Dr. Heidi B. Hammel) See fewer	Wildest Weather in the Solar System (2011)
John Spencer Self - Staff Scientist (as Dr. John R. Spencer) Self - Staff Scientist (as Dr. John R. Spencer) See fewer	Woman in Motion (2019)
Geoff Marcy Self - Professor of Astronomy (as Dr. Geoffrey W. Marcy) Self - Professor of Astronomy (as Dr. Geoffrey W. Marcy) See fewer	Extreme Universe (2010)