Robert J. Raab Jr. resigned as vice chairman and senior managing director at Wilshire Associates, according to spokeswoman Kim Shepherd. "After much deliberation, I have decided that it would be best for my family and for me to consider alternative professional options that will allow me to continue to spend more time with them in the coming years," Mr. Raab said in an internal memo issued Jan. 5. He was ending a nine-month leave of absence that started in spring. Dennis Tito, chairman and CEO, assumed Mr. Raab's responsibilities during his sabbatical, and Wilshire is not now searching for a replacement, Ms. Shepherd said. Mr. Raab was responsible for the analytics division, which he headed since 1976. He also developed the firm's equity risk model and optimization capability and founded the firm's fixed-income division.