His clientele included Jacqueline Kennedy, Diahann Carroll, Carmen de Lavallade, Leontyne Price, Jennie Grossinger and several Miss Americas.

[3] Powell sent him to the International School of Etiquette and Protocol in Washington, and introduced him to civil rights lawyer Belford Lawson.

With Powell and Lawson's help, Tann completed high school and earned a bachelor's degree from Howard University.

[1][3] After a short move back to Newark, New Jersey, with his sister, he attended the Hartford Art School of Fashion in Connecticut.

[1] His clientele included Jacqueline Kennedy, Diahann Carroll, Carmen de Lavallade, Leontyne Price, Jennie Grossinger and several Miss Americas.

[10] In the 1960s, Women's Wear Daily called him a "young individualist" and noted that Tann always designed completely lined dresses and his ideas were "bold" with "careful workmanship".

[1] In 1973 Women's Wear Daily featured Tann in an article titled "The American Spirit of '73", in which they credited his early pioneering work in fashion.

[1] J. C. Penney featured Tann in a page giving tribute to Black Americans in 1999; it was published in several publications.

[1] In 2007, Ebony called him "among the first Blacks to have a successful and visible clothing business in the country's fashion centre on Seventh Avenue in New York".