Who is John Garrett from Dorothy Parker: What Fresh Hell Is This? and what is their importance?

John Garret was one of the many affairs that Dorothy had after her marriage to Parker had failed and before she met Alan Campbell. Garrett is one of particular note because Dorothy, despite her considerable experience with men and several painful heartbreaks, still rushed headlong into the affair with Garrett. He was known for his legendary exploits and delighted in playing one woman off another. Still, Dorothy allowed herself to be vulnerable to this man and suffered greatly for it. The relationship between them indicates that Dorothy was more naïve than even her closest friends realized.