He is known for his contributions to the analysis of statistics and econometrics, particularly in seasonal adjustment and the estimation of signals in economic time series.

[2] Maravall spent his childhood in Paris, then moved to Madrid and finished secondary school at the Colegio Estudio.

In 1975, he moved to Washington, D.C. to work as a staff economist in the Research Division of the Federal Reserve Board of Governors.

In the presence of potentially missing observations[3] the typical (default) technique first performs automatic identification and forecasting of regression-ARIMA models (including adjustment for outliers and calendar effects).

[11] With the collaboration of Víctor Gómez (1987–1999) and Gianluca Caporello (1990–2015), the research was incorporated into several computer programs: TRAMO (“Time series Regression with ARIMA noise, Missing values, and Outliers”), SEATS (“Signal Extraction in ARIMA Time Series”), and TSW (“Tramo and Seats for Windows”).

Rey Juan Carlos Prize in Economics, 2014, sponsored by the Celma Foundation and presented by the King of Spain.

Homage “Celebrating 25 years of TRAMO-SEATS and the 70th birthday of Agustín Maravall,” hosted by the Bank of Spain, March 2014, with the participation of researchers from universities, central banks and statistical agencies in Belgium, France, Germany, Italy, The Netherlands, Spain, Sweden, the UK, and the USA.