Enrique Solano LAEFF My name is Enrique Solano and I came to ESAC in 1989. For 9 years I worked for the IUE project mostly involved in the Final Archive of the mission. In 1998 I moved my office a hundred meters when the involvement of ESA in IUE came to an end and LAEFF took over the Archive responsibilities. Since 2004 I am the Principal Investigator of the Spanish Virtual Observatory. My PhD and the first papers dealt with pulsating stars (delta Scutis, RR Lyraes and lambda Bootis), in particular on the determination of their fundamental physical parameters. At present I am participating in several VO-enabled research projects in the field of brown dwarfs. These are projects that require combining a number of attributes available from different archives, an approach that perfectly fits the Virtual Observatory framework. A brief description of them is as follows: * DISCOVERY OF ULTRA-COOL BROWN DWARFS: Most of the brown dwarfs have been discovered using large-area surveys in the optical and/or in the infrared (2MASS, DENIS, SDSS). In the Virtual Observatory it is possible to efficiently join these large datasets and to use dedicated tools that facilitate the analysis of their contents. We are focusing on the nearby (d < 10 pc) population of brown dwarfs with T spectral type with the aim of shedding light on the problem of the form of the stellar mass function at the lower end, an issue that has been identified as a key VO-Science case both by AstroGrid and EURO-VO. A similar methodology will be applied for the exploitation of UKIDSS, a near-IR survey three magnitudes deeper than 2MASS and whose first Data Release took place in July 2006. With UKIDSS it will be possible to discover faint T dwarfs beyond the 2MASS limiting magnitude and to prove the existence of the theoretically predicted Y-type brown dwarfs, a class of objects cooler than the T dwarfs and whose discovery constitutes one of the key science drivers for the project. * FORMATION OF BROWN DWARFS: The way brown dwarfs are formed is still a matter of debate. One of the competing theories suggests that brown dwarfs are stellar embryos ejected from the formation region due to gravitational interactions before their hydrostatic cores could build up enough mass to eventually start hydrogen burning. Our goal is to check this theory by cross-correlating IPHAS and 2MASS to search, for the first time, young brown dwarfs over large areas of the sky on the basis of their H-alpha emission and IR colors. * CHARACTERIZATION OF STAR-FORMING REGIONS: Taking advantage of VO tools we plan to build the mass function of the clusters of the Orion OB1b association.