His 1992 novel The Bridges of Madison County became a literary phenomenon, telling the poignant story of a brief but unforgettable love affair between a National Geographic photographer and an Iowa farm wife. The book sold over 50 million copies worldwide and was adapted into an acclaimed 1995 film starring Clint Eastwood and Meryl Streep. He later wrote a sequel, A Thousand Country Roads (2002).
Waller's other notable works include Slow Waltz in Cedar Bend (1993), Border Music (1995), Puerto Vallarta Squeeze (1995), High Plains Tango (2005), and The Long Night of Winchell Dear (2007). He was also a talented singer-songwriter who released several music albums. Waller died in 2017, leaving a lasting legacy in American romantic fiction.