Alexander David grew up with a Chinese mother and a white Jewish father in the liberal Park Slope neighborhood of Brooklyn. He attended the predominantly Asian elite Stuyvesant High School. He was comfortable in his skin in both places, but in a world of tribes, the Asian kids considered him white, and the white ones considered him Asian.

“We’re not like a racially blind kind of society,” Mr. David said in an interview recently.

Mr. David’s experience is now part of an unusual project by the Brooklyn Historical Society called “Crossing Borders, Bridging Generations,” which has as its centerpiece a collection of more than 100 oral histories of people who identify themselves as being of mixed heritage, whether through race, ethnicity, religion or nationality.

Three years in the making, “Crossing Bridges” will be completed in mid-January and is uncommon in subject and scope for a historical society, said Annie Valk, vice president of the Oral History Association. It comes with public programs, a school curriculum and an interactive website.

“I think it’s unique in its breadth,” said Deborah Schwartz, president of the historical society. “Oral histories are usually very specific, and this is very wide-ranging, with mixed heritage meaning different things to different people. It is also infused with the reflections of scholars: historians, anthropologists, sociologists.”