She met her future husband Harold Seymour while attending Fenn College (later renamed Cleveland State University), where he was teaching.

After her husband gave up teaching, the couple moved around, for a time living in Ireland even, before settling in New Hampshire.

[2] After a few years, she remarried to Roy Mills, a former Royal Canadian Air Force officer and settled down with him in Naples, Florida.

[3] When Harold Seymour was approached by Oxford University Press to write a book about baseball history, he ended up relying heavily on his wife who later said he could not type and hated research.

[1] Seymour Mills – who was not a fan of baseball – did majority of the research, organized material, structured the notes for the first and second volumes of the work, and edited his manuscripts.

However, after female members of the organization protested, SABR quickly altered their decision and awarded the pair jointly.