On a trip to her hometown of Indianapolis, Sigur discovered a photograph album of the historic home, Riverdale, which belonged to her great great uncle, James Allison, one of the keystones of the thriving Indianapolis automobile industry in the early 1900s.  Her desire to learn more about Allison led to her first book, James Allison, A Biogrpahy of the Engine Manufacturer and Indianapolis 500 Cofounder.

With a love of history, her next undertaking was to learn more about successful Indiana businessman, Tony Hulman, who purchased the Indianapolis Motor Speedway on the verge of being torn down, in 1945.  Hulman resurrected the Speedway and made it into "the greatest spectacle in racing."  The result is the book, Tony Hulman:  The Man Who Saved the Indianapolis Motor Speedway.

Most people thought she would become a journalist as she had been an editor of the world's oldest high school newspaper.   Instead, the world of business was to be her calling.  Both her undergraduate degree and a Master of Business Administration are from the University of North Carolina at Chapel Hill.

In addition to writing biographies of people involved in auto racing, she works as a copywriter specializing in the financial and auto racing industries.  She is active in her Rotary Club.