[1] After a brief career in Hollywood in 1932 as an actor, he moved to New York City, where Aries is Rising, a musical comedy he wrote in 1937,[3] starring Constance Collier, had a brief run at the John Golden Theater.

[2] While in New York, he founded Celebrity Service, with fellow writer, Boston native Ted Strong,[3] in 1939.

[3] Blackwell co-edited Celebrity Register: An Irreverent Compendium of American Quotable Notables with Cleveland Amory in 1963.

[1] Around 1960, Blackwell rented the penthouse apartment of The Briarcliffe, at 171 West 57th Street, the former home of Charles K. Eagle.

[2] A memorial service was held on what would have been his 86th birthday, May 3, 1995, at St. Paul the Apostle Church, 2 Columbus Avenue in Manhattan.