Join or Sign In

By joining TV Guide, you agree to our Terms of Use and acknowledge the data practices in our Privacy Agreement.

Johnny Galecki

Photos

Birth Name:John Mark Galecki

Birth Place:Bree, Belguim

Profession Actor

Image 1 of 25

The Big Bang Theory - Season 7 - "The Itchy Brain Simulation" - Simon Helberg, Jim Parsons, Kunal Nayyar and Johnny Galecki

Image 2 of 25

The Big Bang Theory - Season 7 - "The Raiders Minimization" - Jim Parsons, Kunal Nayyar, Johnny Galecki, Simon Helberg

Image 3 of 25

The Big Bang Theory - Season 3 - "The Creepy Candy Coating Corollary" - Johnny Galecki and Kaley Cuoco

Image 4 of 25

The Big Bang Theory - Season 7 - "The Indecision Amalgamation" - Kunal Nayyar, Kaley Cuoco-Sweeting and Johnny Galecki

Image 5 of 25

The Big Bang Theory - Season 5 - "The Friendship Contraction" - Jim Parsons, Johnny Galecki

Image 6 of 25

The Big Bang Theory - Season 3 - "The Bozeman Reaction" - Johnny Galecki, Kaley Cuoco and Jim Parsons

Image 7 of 25

Johnny Galecki - "Bookies" portraits, Jan. 2003

Image 8 of 25

The Big Bang Theory - Season 8 - "The Anxiety Optimization" - Kunal Nayyar, Simon Helberg and Johnny Galecki

Image 9 of 25

The Big Bang Theory - Season 7 - "The Scavenger Vortex" - Johnny Galecki, Melissa Rauch, Simon Helberg and Mayim Bialik

Image 10 of 25

The Big Bang Theory - Season 1 - "The Big Bran Hypothesis" - Johnny Galecki as Leonard

Image 11 of 25

The Big Bang Theory - Season 1 - "The Bat Jar Conjecture" - Simon Helberg as Howard, Kunal Nayyar as Rajesh, Sara Gilbert as Leslie Winkle and Johnny Galecki as Leonard

Image 12 of 25

The Big Bang Theory - Season 3 - "The Plimpton Stimulation" - Judy Greer, Johnny Galecki

Image 13 of 25

The Big Bang Theory - Season 6 - "The Closet Reconfiguration" - Johnny Galecki, Kaley Cuoco, Mayim Bialik, Jim Parsons and Kunal Nayyar

Image 14 of 25

The Big Bang Theory - Season 5 - "The Recombination Hypothesis" - Jim Parsons, Kunal Nayyar, Simon Helberg, Johnny Galecki

Image 15 of 25

The Big Bang Theory - Season 3 - "The Electric Can Opener Fluctuation" - Simon Helberg, Johnny Galecki, and Kunal Nayyar

Image 16 of 25

The Big Bang Theory - Season 2, "The Killer Robot Instability" - Kunal Nayyar as Rajesh Koothrappali, Simon Helberg as Howard Wolowitz, Jim Parsons as Sheldon, Johnny Galecki as Leonard

Image 17 of 25

The Big Bang Theory - Season 6 - "The Tenure Turbulence" - Johnny Galecki, Regina King and John Ross Bowie

Image 18 of 25

The Big Bang Theory - Season 5 - "The Speckerman Recurrence" - Kaley Cuoco, Johnny Galecki, Jim Parsons

Image 19 of 25

The Big Bang Theory - Season 2 - "The Hofstadter Isotope" - Johnny Galecki as Leonard, Kaley Cuoco as Penny and Kevin Sussman as Stuart

Image 20 of 25

The Big Bang Theory - Season 3 - "The Einstein Approximation" - Johnny Galecki and Kely Cuoco

Image 21 of 25

The Big Bang Theory - Season 5 - "The Beta Test Initiation" - Johnny Galecki, Kaley Cuoco

Image 22 of 25

The Big Bang Theory - Season 2 - "The Classified Materials Turbulance" - Johnny Galecki, Simon Helberg, Kunal Nayyar and Jim Parsons

Image 23 of 25

The Big Bang Theory - Season 5 - "The Pulled Groin Extrapolation" - Kaley Cuoco as Penny, Mayim Bialik as Amy, Johnny Galecki as Leonard

Image 24 of 25

The Big Bang Theory - Season 7 - "The Table Polarization" - Simon Helberg, Kaley Cuoco, Melissa Rauch, Mayim Bialik, Jim Parsons, Johnny Galecki and Nunal Nayyar

Image 25 of 25

The Big Bang Theory - Season 2, "The Bath Item Gift Hypothesis" - Kaley Cuoco as Penny, Michael Trucco as David, Johnny Galecki as Leonard