Thorsten Lemke is the founder of Lemke Software and the creator of the Mac app called GraphicConverter. This app is now used by over 1.5 million customers worldwide. I asked Thorsten about his early years when he was learning Pascal and BASIC on his Commodore C64 and later Atari ST. Thorsten wasn’t sure what he wanted to pursue in high school, but he knew it would be technical. Then, around 1992, with his new Mac, he had a need to convert photos and clipart between file formats. After a lot of file format research, the simple GraphicConverter app on Mac OS 7 was born as shareware. Little did Thorsten know at the time how this Mac app would grow into a major application today. Thorsten tells the amazing story of his career as an Apple developer.