What Happened to Syl Arena?

Syl Arena is a popular name for anyone who has a Canon system and was once interested in shooting with the company's speedlites. The California-based photographer is an educator and author who has been responsible for sharing his expertise on flash phtoography and lighting. While he received recognition early in his career for his accomplishments, Arena is no longer as active as he once was, raising the question: What has he been up to?