Tim Hopkins is the current Algorithms Editor for ACM's Transactions on Mathematical Software and has four decades experience of writing and testing scientific application codes in Fortran. He worked as a lecturer in the School of Computer Science at the University of Kent, UK 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 BSSI using Fortran and MPI.