Leonard Leakey Hofstadter received his PhD at the age of 24. His mother is Dr Beverly Hofstadter, a psychiatrist and neuroscientist. Leonard has an IQ of 173 and works as an experimental physicist. He loves comic books and video games.
Appearances
The Big Bang Theory
Main cast, played by Johnny Galecki
- Episode 1x01: Pilot (Sep 24, 2007)
- Episode 1x02: The Big Bran Hypothesis (Oct 1, 2007)
- Episode 1x03: The Fuzzy Boots Corollary (Oct 8, 2007)
- Episode 1x04: The Luminous Fish Effect (Oct 15, 2007)
- Episode 1x05: The Hamburger Postulate (Oct 22, 2007)
- Episode 1x06: The Middle-Earth Paradigm (Oct 29, 2007)
- Episode 1x07: The Dumpling Paradox (Nov 5, 2007)
- Episode 1x08: The Grasshopper Experiment (Nov 12, 2007)
- Episode 1x09: The Cooper-Hofstadter Polarization (Mar 17, 2008)
- Episode 1x10: The Loobenfeld Decay (Mar 24, 2008)
- Episode 1x11: The Pancake Batter Anomaly (Mar 31, 2008)
- Episode 1x12: The Jerusalem Duality (Apr 14, 2008)
- Episode 1x13: The Bat Jar Conjecture (Apr 21, 2008)
- Episode 1x14: The Nerdvana Annihilation (Apr 28, 2008)
- Episode 1x15: The Pork Chop Indeterminacy (May 5, 2008)
- Episode 1x16: The Peanut Reaction (May 12, 2008)
- Episode 1x17: The Tangerine Factor (May 19, 2008)
- Episode 2x01: The Bad Fish Paradigm (Sep 22, 2008)
- Episode 2x02: The Codpiece Topology (Sep 29, 2008)
- Episode 2x03: The Barbarian Sublimation (Oct 6, 2008)
- Episode 2x04: The Griffin Equivalency (Oct 13, 2008)
- Episode 2x05: The Euclid Alternative (Oct 20, 2008)
- Episode 2x06: The Cooper-Nowitzki Theorem (Nov 3, 2008)
- Episode 2x07: The Panty Piñata Polarization (Nov 10, 2008)
- Episode 2x08: The Lizard-Spock Expansion (Nov 17, 2008)
- Episode 2x09: The White Asparagus Triangulation (Nov 24, 2008)
- Episode 2x10: The Vartabedian Conundrum (Dec 8, 2008)
- Episode 2x11: The Bath Item Gift Hypothesis (Dec 15, 2008)
- Episode 2x12: The Killer Robot Instability (Jan 12, 2009)
- Episode 2x13: The Friendship Algorithm (Jan 19, 2009)
- Episode 2x14: The Financial Permeability (Feb 2, 2009)
- Episode 2x15: The Maternal Capacitance (Feb 9, 2009)
- Episode 2x16: The Cushion Saturation (Mar 2, 2009)
- Episode 2x17: The Terminator Decoupling (Mar 9, 2009)
- Episode 2x18: The Work Song Nanocluster (Mar 16, 2009)
- Episode 2x19: The Dead Hooker Juxtaposition (Mar 30, 2009)
- Episode 2x20: The Hofstadter Isotope (Apr 13, 2009)
- Episode 2x21: The Vegas Renormalization (Apr 27, 2009)
- Episode 2x22: The Classified Materials Turbulence (May 4, 2009)
- Episode 2x23: The Monopolar Expedition (May 11, 2009)
- Episode 3x01: The Electric Can Opener Fluctuation (Sep 21, 2009)
- Episode 3x02: The Jiminy Conjecture (Sep 28, 2009)
- Episode 3x03: The Gothowitz Deviation (Oct 5, 2009)
- Episode 3x04: The Pirate Solution (Oct 12, 2009)
- Episode 3x05: The Creepy Candy Coating Corollary (Oct 19, 2009)
- Episode 3x06: The Cornhusker Vortex (Nov 2, 2009)
- Episode 3x07: The Guitarist Amplification (Nov 9, 2009)
- Episode 3x08: The Adhesive Duck Deficiency (Nov 16, 2009)
- Episode 3x09: The Vengeance Formulation (Nov 23, 2009)
- Episode 3x10: The Gorilla Experiment (Dec 7, 2009)
- Episode 3x11: The Maternal Congruence (Dec 14, 2009)
- Episode 3x12: The Psychic Vortex (Jan 11, 2010)
- Episode 3x13: The Bozeman Reaction (Jan 18, 2010)
- Episode 3x14: The Einstein Approximation (Feb 1, 2010)
- Episode 3x15: The Large Hadron Collision (Feb 8, 2010)
- Episode 3x16: The Excelsior Acquisition (Mar 1, 2010)
- Episode 3x17: The Precious Fragmentation (Mar 8, 2010)
- Episode 3x18: The Pants Alternative (Mar 22, 2010)
- Episode 3x19: The Wheaton Recurrence (Apr 12, 2010)
- Episode 3x20: The Spaghetti Catalyst (May 3, 2010)
- Episode 3x21: The Plimpton Stimulation (May 10, 2010)
- Episode 3x22: The Staircase Implementation (May 17, 2010)
- Episode 3x23: The Lunar Excitation (May 24, 2010)
- Episode 4x01: The Robotic Manipulation (Sep 23, 2010)
- Episode 4x02: The Cruciferous Vegetable Amplification (Sep 30, 2010)
- Episode 4x03: The Zazzy Substitution (Oct 7, 2010)
- Episode 4x04: The Hot Troll Deviation (Oct 14, 2010)
- Episode 4x05: The Desperation Emanation (Oct 21, 2010)
- Episode 4x06: The Irish Pub Formulation (Oct 28, 2010)
- Episode 4x07: The Apology Insufficiency (Nov 4, 2010)
- Episode 4x08: The 21-Second Excitation (Nov 11, 2010)
- Episode 4x09: The Boyfriend Complexity (Nov 18, 2010)
- Episode 4x10: The Alien Parasite Hypothesis (Dec 9, 2010)
- Episode 4x11: The Justice League Recombination (Dec 16, 2010)
- Episode 4x12: The Bus Pants Utilization (Jan 6, 2011)
- Episode 4x13: The Love Car Displacement (Jan 20, 2011)
- Episode 4x14: The Thespian Catalyst (Feb 3, 2011)
- Episode 4x15: The Benefactor Factor (Feb 10, 2011)
- Episode 4x16: The Cohabitation Formulation (Feb 17, 2011)
- Episode 4x17: The Toast Derivation (Feb 24, 2011)
- Episode 4x18: The Prestidigitation Approximation (Mar 10, 2011)
- Episode 4x19: The Zarnecki Incursion (Mar 31, 2011)
- Episode 4x20: The Herb Garden Germination (Apr 7, 2011)
- Episode 4x21: The Agreement Dissection (Apr 28, 2011)
- Episode 4x22: The Wildebeest Implementation (May 5, 2011)
- Episode 4x23: The Engagement Reaction (May 12, 2011)
- Episode 4x24: The Roommate Transmogrification (May 19, 2011)
- Episode 5x01: The Skank Reflex Analysis (Sep 22, 2011)
- Episode 5x02: The Infestation Hypothesis (Sep 22, 2011)
- Episode 5x03: The Pulled Groin Extrapolation (Sep 29, 2011)
- Episode 5x04: The Wiggly Finger Catalyst (Oct 6, 2011)
- Episode 5x05: The Russian Rocket Reaction (Oct 13, 2011)
- Episode 5x06: The Rhinitis Revelation (Oct 20, 2011)
- Episode 5x07: The Good Guy Fluctuation (Oct 27, 2011)
- Episode 5x08: The Isolation Permutation (Nov 3, 2011)
- Episode 5x09: The Ornithophobia Diffusion (Nov 10, 2011)
- Episode 5x10: The Flaming Spittoon Acquisition (Nov 17, 2011)
- Episode 5x11: The Speckerman Recurrence (Dec 8, 2011)
- Episode 5x12: The Shiny Trinket Maneuver (Jan 12, 2012)
- Episode 5x13: The Recombination Hypothesis (Jan 19, 2012)
- Episode 5x14: The Beta Test Initiation (Jan 26, 2012)
- Episode 5x15: The Friendship Contraction (Feb 2, 2012)
- Episode 5x16: The Vacation Solution (Feb 9, 2012)
- Episode 5x17: The Rothman Disintegration (Feb 16, 2012)
- Episode 5x18: The Werewolf Transformation (Feb 23, 2012)
- Episode 5x19: The Weekend Vortex (Mar 8, 2012)
- Episode 5x20: The Transporter Malfunction (Mar 29, 2012)
- Episode 5x21: The Hawking Excitation (Apr 5, 2012)
- Episode 5x22: The Stag Convergence (Apr 26, 2012)
- Episode 5x23: The Launch Acceleration (May 3, 2012)
- Episode 5x24: The Countdown Reflection (May 10, 2012)
- Episode 6x01: The Date Night Variable (Sep 27, 2012)
- Episode 6x02: The Decoupling Fluctuation (Oct 4, 2012)
- Episode 6x03: The Higgs Boson Observation (Oct 11, 2012)
- Episode 6x04: The Re-Entry Minimization (Oct 18, 2012)
- Episode 6x05: The Holographic Excitation (Oct 25, 2012)
- Episode 6x06: The Extract Obliteration (Nov 1, 2012)
- Episode 6x07: The Habitation Configuration (Nov 8, 2012)
- Episode 6x08: The 43 Peculiarity (Nov 15, 2012)
- Episode 6x09: The Parking Spot Escalation (Nov 29, 2012)
- Episode 6x10: The Fish Guts Displacement (Dec 6, 2012)
- Episode 6x11: The Santa Simulation (Dec 13, 2012)
- Episode 6x12: The Egg Salad Equivalency (Jan 3, 2013)
- Episode 6x13: The Bakersfield Expedition (Jan 10, 2013)
- Episode 6x14: The Cooper/Kripke Inversion (Jan 31, 2013)
- Episode 6x15: The Spoiler Alert Segmentation (Feb 7, 2013)
- Episode 6x16: The Tangible Affection Proof (Feb 14, 2013)
- Episode 6x17: The Monster Isolation (Feb 21, 2013)
- Episode 6x18: The Contractual Obligation Implementation (Mar 7, 2013)
- Episode 6x19: The Closet Reconfiguration (Mar 14, 2013)
- Episode 6x20: The Tenure Turbulence (Apr 4, 2013)
- Episode 6x21: The Closure Alternative (Apr 25, 2013)
- Episode 6x22: The Proton Resurgence (May 2, 2013)
- Episode 6x23: The Love Spell Potential (May 9, 2013)
- Episode 6x24: The Bon Voyage Reaction (May 16, 2013)
- Episode 7x01: The Hofstadter Insufficiency (Sep 26, 2013)
- Episode 7x02: The Deception Verification (Sep 26, 2013)
- Episode 7x03: The Scavenger Vortex (Oct 3, 2013)
- Episode 7x04: The Raiders Minimization (Oct 10, 2013)
- Episode 7x05: The Workplace Proximity (Oct 17, 2013)
- Episode 7x06: The Romance Resonance (Oct 24, 2013)
- Episode 7x07: The Proton Displacement (Nov 7, 2013)
- Episode 7x08: The Itchy Brain Simulation (Nov 14, 2013)
- Episode 7x09: The Thanksgiving Decoupling (Nov 21, 2013)
- Episode 7x10: The Discovery Dissipation (Dec 5, 2013)
- Episode 7x11: The Cooper Extraction (Dec 12, 2013)
- Episode 7x12: The Hesitation Ramification (Jan 2, 2014)
- Episode 7x13: The Occupation Recalibration (Jan 9, 2014)
- Episode 7x14: The Convention Conundrum (Jan 30, 2014)
- Episode 7x15: The Locomotive Manipulation (Feb 6, 2014)
- Episode 7x16: The Table Polarization (Feb 27, 2014)
- Episode 7x17: The Friendship Turbulence (Mar 6, 2014)
- Episode 7x18: The Mommy Observation (Mar 13, 2014)
- Episode 7x19: The Indecision Amalgamation (Apr 3, 2014)
- Episode 7x20: The Relationship Diremption (Apr 10, 2014)
- Episode 7x21: The Anything Can Happen Recurrence (Apr 24, 2014)
- Episode 7x22: The Proton Transmogrification (May 1, 2014)
- Episode 7x23: The Gorilla Dissolution (May 8, 2014)
- Episode 7x24: The Status Quo Combustion (May 15, 2014)
- Episode 8x01: The Locomotion Interruption (Sep 22, 2014)
- Episode 8x02: The Junior Professor Solution (Sep 22, 2014)
- Episode 8x03: The First Pitch Insufficiency (Sep 29, 2014)
- Episode 8x04: The Hook-Up Reverberation (Oct 6, 2014)
- Episode 8x05: The Focus Attentuation (Oct 13, 2014)
- Episode 8x06: The Expedition Approximation (Oct 20, 2014)
- Episode 8x07: The Misinterpretation Agitation (Oct 30, 2014)
- Episode 8x08: The Prom Equivalency (Nov 6, 2014)
- Episode 8x09: The Septum Deviation (Nov 13, 2014)
- Episode 8x10: The Champagne Reflection (Nov 20, 2014)
- Episode 8x11: The Clean Room Infiltration (Dec 11, 2014)
- Episode 8x12: The Space Probe Disintegration (Jan 8, 2015)
- Episode 8x13: The Anxiety Optimization (Jan 29, 2015)
- Episode 8x14: The Troll Manifestation (Feb 5, 2015)
- Episode 8x15: The Comic Book Store Regeneration (Feb 19, 2015)
- Episode 8x16: The Intimacy Acceleration (Feb 26, 2015)
- Episode 8x17: The Colonization Application (Mar 5, 2015)
- Episode 8x18: The Leftover Thermalization (Mar 12, 2015)
- Episode 8x19: The Skywalker Incursion (Apr 2, 2015)
- Episode 8x20: The Fortification Implementation (Apr 9, 2015)
- Episode 8x21: The Communication Deterioration (Apr 16, 2015)
- Episode 8x22: The Graduation Transmission (Apr 23, 2015)
- Episode 8x23: The Maternal Combustion (Apr 30, 2015)
- Episode 8x24: The Commitment Determination (May 7, 2015)
- Episode 9x01: The Matrimonial Momentum (Sep 21, 2015)
- Episode 9x02: The Separation Oscillation (Sep 28, 2015)
- Episode 9x03: The Bachelor Party Corrosion (Oct 5, 2015)
- Episode 9x04: The 2003 Approximation (Oct 12, 2015)
- Episode 9x05: The Perspiration Implementation (Oct 19, 2015)
- Episode 9x06: The Helium Insufficiency (Oct 26, 2015)
- Episode 9x07: The Spock Resonance (Nov 5, 2015)
- Episode 9x08: The Mystery Date Observation (Nov 12, 2015)
- Episode 9x09: The Platonic Permutation (Nov 19, 2015)
- Episode 9x10: The Earworm Reverberation (Dec 10, 2015)
- Episode 9x11: The Opening Night Excitation (Dec 17, 2015)
- Episode 9x12: The Sales Call Sublimation (Jan 7, 2016)
- Episode 9x13: The Empathy Optimization (Jan 14, 2016)
- Episode 9x14: The Meemaw Materialization (Feb 4, 2016)
- Episode 9x15: The Valentino Submergence (Feb 11, 2016)
- Episode 9x16: The Positive Negative Reaction (Feb 18, 2016)
- Episode 9x17: The Celebration Experimentation (Feb 25, 2016)
- Episode 9x18: The Application Deterioration (Mar 10, 2016)
- Episode 9x19: The Solder Excursion Diversion (Mar 31, 2016)
- Episode 9x20: The Big Bear Precipitation (Apr 7, 2016)
- Episode 9x21: The Viewing Party Combustion (Apr 21, 2016)
- Episode 9x22: The Fermentation Bifurcation (Apr 28, 2016)
- Episode 9x23: The Line Substitution Solution (May 5, 2016)
- Episode 9x24: The Convergence Convergence (May 12, 2016)
- Episode 10x01: The Conjugal Conjecture (Sep 19, 2016)
- Episode 10x02: The Military Miniaturization (Sep 26, 2016)
- Episode 10x03: The Dependence Transcendence (Oct 3, 2016)
- Episode 10x04: The Cohabitation Experimentation (Oct 10, 2016)
- Episode 10x05: The Hot Tub Contamination (Oct 17, 2016)
- Episode 10x06: The Fetal Kick Catalyst (Oct 27, 2016)
- Episode 10x07: The Veracity Elasticity (Nov 3, 2016)
- Episode 10x08: The Brain Bowl Incubation (Nov 10, 2016)
- Episode 10x09: The Geology Elevation (Nov 17, 2016)
- Episode 10x10: The Property Division Collision (Dec 1, 2016)
- Episode 10x11: The Birthday Synchronicity (Dec 15, 2016)
- Episode 10x12: The Holiday Summation (Jan 5, 2017)
- Episode 10x13: The Romance Recalibration (Jan 19, 2017)
- Episode 10x14: The Emotion Detection Automation (Feb 2, 2017)
- Episode 10x15: The Locomotion Reverberation (Feb 9, 2017)
- Episode 10x16: The Allowance Evaporation (Feb 16, 2017)
- Episode 10x17: The Comic-Con Conundrum (Feb 23, 2017)
- Episode 10x18: The Escape Hatch Identification (Mar 9, 2017)
- Episode 10x19: The Collaboration Fluctuation (Mar 30, 2017)
- Episode 10x20: The Recollection Dissipation (Apr 6, 2017)
- Episode 10x21: The Separation Agitation (Apr 13, 2017)
- Episode 10x22: The Cognition Regeneration (Apr 27, 2017)
- Episode 10x23: The Gyroscopic Collapse (May 4, 2017)
- Episode 10x24: The Long Distance Dissonance (May 11, 2017)
- Episode 11x01: The Proposal Proposal (Sep 25, 2017)
- Episode 11x02: The Retraction Reaction (Oct 2, 2017)
- Episode 11x03: The Relaxation Integration (Oct 9, 2017)
- Episode 11x04: The Explosion Implosion (Oct 16, 2017)
- Episode 11x05: The Collaboration Contamination (Oct 23, 2017)
- Episode 11x06: The Proton Regeneration (Nov 2, 2017)
- Episode 11x07: The Geology Methodology (Nov 9, 2017)
- Episode 11x08: The Tesla Recoil (Nov 16, 2017)
- Episode 11x09: The Bitcoin Entanglement (Nov 30, 2017)
- Episode 11x10: The Confidence Erosion (Dec 7, 2017)
- Episode 11x11: The Celebration Reverberation (Dec 14, 2017)
- Episode 11x12: The Matrimonial Metric (Jan 4, 2018)
- Episode 11x13: The Solo Oscillation (Jan 11, 2018)
- Episode 11x14: The Separation Triangulation (Jan 18, 2018)
- Episode 11x15: The Novelization Correlation (Feb 1, 2018)
- Episode 11x16: The Neonatal Nomenclature (Mar 1, 2018)
- Episode 11x17: The Athenaeum Allocation (Mar 8, 2018)
- Episode 11x18: The Gates Excitation (Mar 29, 2018)
- Episode 11x19: The Tenant Disassociation (Apr 5, 2018)
- Episode 11x20: The Reclusive Potential (Apr 12, 2018)
- Episode 11x21: The Comet Polarization (Apr 19, 2018)
- Episode 11x22: The Monetary Insufficiency (Apr 26, 2018)
- Episode 11x23: The Sibling Realignment (May 3, 2018)
- Episode 11x24: The Bow Tie Asymmetry (May 10, 2018)
- Episode 12x01: The Conjugal Configuration (Sep 24, 2018)
- Episode 12x02: The Wedding Gift Wormhole (Sep 27, 2018)
- Episode 12x03: The Procreation Calculation (Oct 4, 2018)
- Episode 12x04: The Tam Turbulence (Oct 11, 2018)
- Episode 12x05: The Planetarium Collision (Oct 18, 2018)
- Episode 12x06: The Imitation Perturbation (Oct 25, 2018)
- Episode 12x07: The Grant Allocation Derivation (Nov 1, 2018)
- Episode 12x08: The Consummation Deviation (Nov 8, 2018)
- Episode 12x09: The Citation Negation (Nov 15, 2018)
- Episode 12x10: The VCR Illumination (Dec 6, 2018)
- Episode 12x11: The Paintball Scattering (Jan 3, 2019)
- Episode 12x12: The Propagation Proposition (Jan 10, 2019)
- Episode 12x13: The Confirmation Polarization (Jan 17, 2019)
- Episode 12x14: The Meteorite Manifestation (Jan 31, 2019)
- Episode 12x15: The Donation Oscillation (Feb 7, 2019)
- Episode 12x16: The D&D Vortex (Feb 21, 2019)
- Episode 12x17: The Conference Valuation (Mar 7, 2019)
- Episode 12x18: The Laureate Accumulation (Apr 4, 2019)
- Episode 12x19: The Inspiration Deprivation (Apr 18, 2019)
- Episode 12x20: The Decision Reverberation (Apr 25, 2019)
- Episode 12x21: The Plagiarism Schism (May 2, 2019)
- Episode 12x22: The Maternal Conclusion (May 9, 2019)
- Episode 12x23: The Change Constant (May 16, 2019)
- Episode 12x24: The Stockholm Syndrome (May 16, 2019)