Allison + Partners is acquiring Frause to bolster the San Francisco-based firm's presence in Seattle and expand to Portland.
Bob Frause, who founded the firm in 1998, will continue as counsel to his shop and work with Allison's management in exploring international opportunities.
His firm has a strong base in the economic development, tourism, digital, real estate and government categories.
Key Frause executives such as senior VPs Natalie Price, Laure Ware and Sue Gillespie, along with VPs Nathan Hambley and Lisa Smith, will remain onboard.
The Frause team will report to Allison/Seattle GM Richard Kendall, who was Frause's second hire. He said the cultures of both shops are "well aligned."
MDC Partners owns Allison.