Author · 30 titles
Callahan's Crosstime SaloonBook· 1977
TelempathBook· 1976
MindkillerBook· 1982
Callahan's legacyBook· 1996
Callahan's SecretBook· 1986
Very Bad DeathsBook· 2004
Callahan's KeyBook· 2000
Time PressureBook· 1987
Variable StarBook· 2006
The free lunchBook· 2001
Night of powerBook· 1985
Time Travelers Strictly CashBook· 1981