According to writer Michael Davis, "Sesame Street"'s curriculum began addressing affective goals more overtly during the 1980s. For example, the producers addressed grief after the 1982 death of Will Lee, who had played Mr. Hooper since the show's premiere. Author David Borgenicht called the episode "poignant", and Davis called it "a landmark broadcast" and "a truly memorable episode, one of the show's best". For the 1988 and 1989 seasons, the topics of love, marriage, and childbirth were addressed when the show's staff created a storyline in which the characters Luis and Maria fall in love, marry, and have a child, Gabi. Extensive research was done before these episodes were written and produced, to ascertain their focus, and after they aired, to analyze the effect they had on viewers. The show also addressed real-life disasters. For example, the producers addressed the September 11 terrorist attacks with an episode that aired in early 2002. They also produced a series of four episodes that aired after Hurricane Katrina in 2005.