CHICAGO — Siebert Brandford Shank & Co. LLC has hired the Chicago Transit Authority's former chief financial officer Karen Walker to lead its Chicago office, filling a public finance banking void left by Elizabeth Gallagher Coolidge's recent leap to another firm.

Walker joins Siebert as a managing director and head of the Chicago office effective Monday. The move marks a return for Walker to public finance banking. She held banking positions at the former A.G. Edwards & Sons Inc. and former Banc of America Securities LLC before jumping to the issuer side to join the Illinois Finance Authority as director of financial services. She took the reins of the CTA as CFO and treasurer in 2009.

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