Peter Arno cartooned for THE NEW YORKER and other magazines from 1925 until his death in 1968, which is to say he was still in print during my early childhood and was almost ubiquitous in cartoon and humor anthologies for years afterward. His stuff was a bit too sophisticated for me as a kid, but later I learned to love his style, his flawless sense of composition and character, and his bold use of tones to establish light and dimension. His humor is somewhat mean and a little elitist, but it is almost always funny. The impact of some of these single panels (usually published full page as seen here) is often startlingly punchy and solidly funny in a laugh out loud way. These are from a compilation published in 1979 titled, simply PETER ARNO. There are a number of older collections available from used book sites, for any who are interested.
The three Arno classics I picked here I chose mainly for the exemplary economy used to convey everything from mood & attitude, to setting & perspective. Deceptively simple and highly expert.