[2] She is a four-time Olympian, and a two-time medalist for pistol shooting at the Pan American Games (1991 in Havana, Cuba and 1999 in Winnipeg, Manitoba, Canada).

[3] Callahan, born in Columbia, South Carolina, started out her sporting career in 1980, when she learned shooting with the Metropolitan Police Department in Washington D.C. She went on to become a five-time women's police revolver champion in various local competitions, until she took up international, Olympic-style shooting, after joining the U.S. Army reserve in 1985.

She captured three more medals (one silver and two bronze) in air and pistol shooting at the 1992, 2001, and 2005 ISSF World Cup series.

[6] She competed only in the women's 25 m pistol, where she was able to shoot 287 targets in the precision stage, and 288 in the rapid fire, for a total score of 575 points, finishing only in twenty-fifth place.

[7][8] As of 2024 she coaches Ohio State University's shooting team, and one of her students is 2024 Olympian Ada Korkhin.