Information listed below is provided for historial research purposes.

Gertrude Antonette Woodcock Seibert's biography is taken from "Historical Dictionary of Jehovah's Witnesses" by George D. Chryssides

"An early Bible Student, Gertrude Seibert was initially known for her poetry, which was first published in Zion's Watch Tower in 1900. Some of her verse was set to music by M.L. McPhail and appeared in Zion's Glad Songs. Her poems were collected in The Sweet-Briar Rose (1909) and In the Garden of the Lord (1913), both published by the Watch Tower Bible and Tract Society. A Later Volume, The Heavenly Bridegroom (1918) was self-published. When Charles Taze Russell died, she wrote "Gone Home" as a tribute.

Seibert was also a compiler. She selected the Zion's Watch Tower articles that were recommended for study in Daily Heavenly Manna (1905) and compiled two of the for appendixes in the Watch Tower Berean Bible (1907). The other two appendixes in the Watch Tower Berean Bible (1907). The other two appendixes were by Clayton J. Woodworth, who was a close Family Friend and collaboration, as was George Fisher. These appendixes indexed selected biblical themes, directing readers to relevant Watch Tower publications.

It was Seibert who suggested the title for the controversial The Finished Mystery (1917) and collaborated with Fisher and Woodworth on its production. She appears to have had a major role in preparing the text, although the extent of her contribution to the project is not known.

After 1920 Seibert embarked on worldwide travel, visiting various countries and continuing to promote the work of IBSA."

Mrs. Seibert continued with the organization under the leadership of Judge Rutherford.