Athene Holding Ltd., the Bermuda-based parent company of West Des Moines-based Athene USA, announced Friday that it has promoted Brenda Cushing to chief financial officer, effective Aug. 20. Cushing currently is CFO of Athene USA, a position she has held since Athene's acquisition of Aviva USA last year. Her 28-year career includes senior finance roles with AmerUs Group Co., which was acquired by Aviva PLC in 2006. Cushing, an Iowa State University graduate, will fill the position now held by David Johnson, who leaves Athene Holding to take a job closer to his family near Washington, D.C.  An Athene USA spokesperson said Cushing's successor has not yet been named.