John Leslie is a name that may refer to various individuals in different fields, including art. However, without more context, it is difficult to pinpoint which John Leslie you're referring to, especially as it pertains to an art historian's interest. If you meant John Leslie the artist, I'm afraid there is no well-documented artist by that name with a birth year of 1945 and a death year of 2010 that has received significant historical recognition or scholarly attention.
On the other hand, if you're referring to John Leslie in a different context, such as John Leslie the adult film star and director, born John Leslie Nuzzo in 1945 and who passed away in 2010, then it's important to note that while he had a significant impact on the adult film industry, he wouldn't typically be the subject of a traditional art historian's study.
If you are looking for information on a different John Leslie, or if the artist you're referring to is lesser-known or emerging, additional details would be needed to provide an accurate biographical profile. There are also historical figures with the name John Leslie, such as John Leslie, the 16th-century Scottish bishop and historian, but he was not an artist.
For a precise and detailed biography, it would be helpful to have more context or clarification on the John Leslie of interest, including their full name, any known aliases, their specific field of work within the arts, and any notable works or contributions to the art world.