Presently, Karen Winifred Colonias holds the position of President, Chief Executive Officer & Director at Simpson Manufacturing Co., Inc. and Chief Executive Officer of Simpson Strong-Tie International, Inc. (a subsidiary of Simpson Manufacturing Co., Inc.).

She is also on the board of Reliance Steel & Aluminum Co. and Tube Service Co.

She previously was Vice President of Simpson Strong-Tie Co., Inc. and Civil Engineer at Bechtel Corp.

She received an undergraduate degree and an MBA from The California State University.