Did Tibor Sekelj help in developing the language Esperanto?
No, but he used it extensively
Yes, he was one of the main contributors
He proposed major Esperanto reforms
He translated major works into Esperanto
Answer
Tibor Sekelj did not help in developing the language Esperanto, but he used it extensively throughout his life. He was a polyglot who spoke more than 20 languages, and Esperanto was one of his favorites. He wrote extensively in Esperanto, and his work has been translated into many other languages.
Trekking Through Tibor Sekelj's Trail: A Quiz on the Life and Adventures of the Hungarian Author and Explorer