Richard J. Hanson has more than five decades of practical experience in the development of mathematical software. He has worked in academia, for the United States government, and for private software firms. He now has his own consulting business and is currently working on a new parallel version of the ARPACK eigenvalue package.

Tim Hopkins is the current algorithms editor for ACM Transactions on Mathematical Software and has four decades of experience writing and testing scientific application codes in Fortran. He worked as a lecturer in the School of Computer Science at the University of Kent for 35 years before retiring in 2010. He has been a member of IFIP Working Group 2.5 on Numerical Software since 2003 and is currently writing parallel simulation codes for Bergen Software Services International, using Fortran and MPI.