Leslie claims the laptop and hard drive were stolen from a black Mercedes parked outside of Loom nightclub in Cologne, Germany, on the night of Oct. 23.
"Last night something very personal, something very special was taken. I'm offering a reward of $20,000," Leslie explained in a YouTube video. "That reward is really not even close to the value of everything that we lost," he continued. "I've been coming to Germany for like six years. I do it because I love the people here. I love the time that I have here. I love the experience that i have sharing my music with all of you. So last night the tools that I have to share with all of you, the videos i have of all the tours, the memories that we've made together, the music that I make, everything is gone, so if you have any information, if you've seen anything, if you hear anything, get at me."
The 'Me & U' producer also appealed to his Twitter followers, beseeching fans to help him retrieve the laptop, which apparently was not completely backed up.
"For the record, I had so many amazing music & visual projects on that MacBook that I was working on to share with u this winter," Leslie revealed.
If you have any information regarding Ryan Leslie's lost laptop and hard drive, contact him at email@example.com.