The SIESTA project was initiated by Pablo Ordejón (then at the Univ. de Oviedo), and José M. Soler and Emilio Artacho (Univ. Autónoma de Madrid, UAM). The development team was then joined by Alberto García (then at Univ. del País Vasco, Bilbao), Daniel Sánchez-Portal (UAM), and Javier Junquera (Univ. de Oviedo and later UAM), and sometime later by Julian Gale (then at Imperial College, London). In 2007 José M. Cela (Barcelona Supercomputing Center, BSC) became a core developer and member of the Steering Committee.
The original TranSIESTA module was developed by Pablo Ordejón and José L. Mozos (then at ICMAB-CSIC), and Mads Brandbyge, Kurt Stokbro, and Jeremy Taylor (Technical Univ. of Denmark, DTU).
The current TranSIESTA module within SIESTA is developed by Nick R. Papior and Mads Brandbyge (DTU). Nick R. Papior became a core developer and member of the Steering Committee in 2015.
Other contributors (we apologize for any omissions):
O.F. Sankey, D.J. Niklewski and D.A. Drabold made the FIREBALL code available to P. Ordejón. Although we no longer use the routines in that code, it was essential in the initial development of SIESTA, which still uses many of the algorithms developed by them.