Jablonski began as the oil editor at the Journal of Commerce, where she made her mark with a 1948 interview in Caracas with Juan Pablo Pérez Alfonso, then the Venezuelan oil minister, which cleverly synthesized the developing nations' viewpoint, in those days rarely heard in the Western hemisphere. She moved to Petroleum Week journal in 1954 and cemented her reputation, speaking on equal terms with oil ministers and company chairmen. A rare woman in a man's world, she was known throughout the oil industry simply as "Wanda".
