History

Throughout the years, we have observed many significant milestones including our 20th anniversary in 2008. Here are just a few dates worthy of mention:

• 1988 - Treadwell and Associates is founded by Donald D. Treadwell
• 1989 - Frank L. Rollo joins the firm
• 1991 - Firm name changes to Treadwell & Rollo, Inc.
• 2000 - Oakland office opens
• 2003 - Philip Tringale is appointed President and CEO
• 2004 - Sacramento office opens
• 2005 - Ranked as one of the "Largest Engineering Firms in the Bay Area" by the San Francisco Business Times
• 2006 - Bozeman, Montana office opens
• 2007 - The firm achieves Bay Area Green Business certification
• 2007 - San Jose office opens
• 2008 - Treadwell & Rollo celebrates 20 years of business