Martin van Waardenberg (b. 1956) is a Dutch actor and comedian who plays Buurman Baasje on Sesamstraat, the Dutch co-production of Sesame Street.
Buurman Baasje (Next Door Neighbor Bossy) is the grumpy neighbor who lives around the corner, behind a big fence. He hates it when Tommie, Ieniemienie, Purk and/or Pino disturb him, but with the help of the other actors, he is usually a victim of his own grumpiness. His personality is similar to that of Oscar the Grouch.
Buurman Baasje's real name is Mr. Drommel; when the new neighbor called Tommie "baasje" in his debut episode, Tommie invented his nickname.
Buurman Baasje was added to the cast when Aart Staartjes, who originally played the grumpy character on the show, announced that he would be retiring from all children's TV except Sesamstraat. Since the new neighbor's arrival, Aart has become a little tamer and more friendly, the latter of which has to do with the death of Sesamstraat's grandfather figure Lex Goudsmit.
Especially for Pino, he uses several derogatory nicknames like "blue heron." Buurman Baasje doesn't live on Sesamstraat, but rather on the adjacent Maanzaad Straat (Poppyseed Street).
Van Waardenberg is a comedy actor and performs as part of the duo Waardenberg & De Jong.