In an end-of-year reminiscence, Frank Rich remembers his longtime friend, playwright Wendy Wasserstein, who died last January. “The Wendy Wasserstein who was always there for everybody (including me) at every crisis and celebration, the Wendy with that uproarious (yet musical) laugh and funny (yet never bitchy) dialogue for every fraught situation, the Wendy the whole world knew and adored was also an intensely private person who left many mysteries behind.”