When Michael Chesley Johnson paints outdoors, he spends about as much time working in pastel as he does in oil and that often prompts students to ask how he decides which medium to use.  “I don't find that a particular subject matter is more appropriately handled in one medium or another,” he says in response. Johnson will be discussing those aspects of his extraordinary artwork and more during his presentation at the 1st Annual PleinAir Convention & Expo from April 12-15, 2012.