Jerry Robinson began finishing the art and inking from Bob Kane's penciled layouts with Detective Comics #36 (January, 1940) "Professor Hugo Strange," written by Bill Finger.
Jerry Robinson polished a gem with his contributions to Batman. He, along with Sheldon Moldoff (still alive at 91 years old) and George Roussos (died in 2000 of a heart attack at 84 years old), made Bob Kane's Batman art look more professional. In Comics Interview #31 (1986) George Roussos said, "Jerry was always behind - he was always whiting out things and reinking them. Bob's stuff was so sketchy, Jerry had to do a lot of work. My work was quite easy. I used to erase Bob's backgrounds and put my own in. I'd put big moons in and make the shadows large and full. I did shadows for effect." George Roussos drew and inked the background art on Batman beginning with Batman #2 (Summer, 1940) "The Joker Meets the Cat-Woman," written by Bill Finger, until Detective Comics #83 (January, 1944) "Accidentally on Purpose," written by Don Cameron.
Jerry Robinson said he contributed tremendously to the creation of Robin the Boy Wonder. He suggested adapting Robin Hood's costume, the name Robin, and he added the "R" monogram on Bob Kane's sketch of Robin as counterpoint to the bat on Batman's costume.
In Comics Interview #31 (1986), Jerry Robinson said, "People in the field immediately noticed the resemblance of the name, Robin, to my own name, Robinson. I remember receiving a lot of teasing about it and it bothered me at the time. When you're 17 or 18 and desperately trying to appear older, you don't want to be known as 'The Boy Wonder.'"
Jerry Robinson was not the sole creator of the Joker, but he did contribute to the creation of the Joker. He created a drawing of a playing card with a Joker that looked like a court jester. Bill Finger used these Joker cards as the Joker's calling card which the Joker would leave after he killed someone.
Jerry Robinson was hired away from Bob Kane's studio by DC and they allowed him to fully draw and ink Batman stories and covers all himself by Batman #14 (December, 1942) "The Case Batman Failed To Solve!!!," written by Don Cameron. Jerry Robinson left Batman after Batman #34 (April, 1946) "Tired Tracks."
In 1975 Neal Adams begin a campaign to get Warner Brothers/DC to credit Jerry Siegel and Joe Shuster as the creators of Superman and give them a financial compensation. On December 1st, 1975, Neal Adams appeared on Tom Snyder's Tomorrow Show on NBC and publicly shamed Warner Brothers. Jerry Robinson negotiated with Warner Brothers to give Jerry Siegel and Joe Shuster creater credits on all Superman comic books, films and TV series, and a pension and full medical benefits and, on December 23rd, 1975, Warner Brothers began giving $20,000 a year for both Jerry Siegel and Joe Shuster, payment of medical and law bills, and having all Superman stories from that point on (including the movies and TV series) accompanied by the words, "Superman created by Jerry Siegel and Joe Shuster." The deal was announced to the public by Walter Cronkite on CBS News in 1975.
Neal Adams with Joe Shuster and Jerry Siegel, and Jerry Robinson.