In 1974 he founded Am-Tex Corporation, a firm that managed water utilities for municipal and commercial entities throughout Texas. In 20 years, Mr. Callegari grew the company from a family operation to a strong regional corporation employing hundreds throughout Southeast, Central, and North Texas. He served as AM-TEXs Chairman of the Board and Chief Executive officer until selling the firm to the fourth largest utility in the world in 1993. He currently owns WC Engineers, Inc., which provides engineering consulting services for the water/wastewater and environmental industries.

In addition to his Professional Engineering credentials, Mr. Callegari holds Class A certifications in water and wastewater operations. He has participated on numerous professional organizations and committees relating to water, environmental and engineering issues. He was co-founder and former president of the Association of Water Board Directors, and served as the first chairman of the Texas Water Commission Wastewater Certification Advisory Committee.

Mr. Callegari was inducted into the LSU College of Engineering Hall of Distinction in 1997, and the LSU Alumni Hall of Distinction in 1999. His name was added to the LSU Alumni Center Wall of Honor in year 2000. In addition the William A. Callegari Environmental Center located at LSU was named in his honor. In 2006, he was named the Distinguished Engineer of the Year by the Texas Engineering Foundation. The following year, in 2007, he received the Distinguished Alumni Award from the University of Houston School of Engineering. Mr. Callegari is listed in the Who's Who in The South and Southeast, Worldwide, and Environmental Registry. In 2011, he was induced as a fellow in the Texas Engineering Foundation.

Community involvement has been an important part of Bill Callegari=s life and career. He is an active member of his church community and has served as a member of his church finance council for many years. Before his election to the Texas Legislature in 2000, he was involved in numerous activities in both the Katy and Houston areas, including local chambers of commerce and various professional and local organizations. Mr. Callegari served on the Katy Independent School District Board of Trustees in the mid-eighties, and served as a Republican precinct chair for approximately 20 years.

Representative Callegari has represented the constituents and families of District 132 since his election in 2000. He serves as Chairman of the House Committee on Government Efficiency and Reform and on the House Urban Affairs Committee. In prior sessions Representative Callegari was Vice Chairman of the House Committee on Natural Resources, and served on the Transportation, Land and Resource Management, Cultural and Recreational Resources, Calendars, and the Local and Consent Calendars committees. Representative Callegari currently serves as Chairman of the House Research Organization and as Chairman of the House Greater Houston Area Delegation.

As one of the House of Representatives' leading water experts he has authored and passed key pieces of legislation affecting water utilities, water districts, and groundwater management. As a staunch fiscal conservative, Representative Callegari has consistently supported legislation lowering the appraisal cap, refunding budget surpluses to Texas taxpayers, and establishing firm a firm spending cap on government spending. In addition, he has worked to pass legislation promoting the right to life, and to curb the problem of drunk driving.

Representative Callegari has received multiple awards and recognition for his voting record from numerous organizations, including the Texas Association of Business, Institute for Justice, Texans for Fiscal Responsibility, National Rifle Association, Texas Right to Life, Texas Landowners Council, Texans for Lawsuit Reform, Texas Water Conservation Association, Texas Society of Professional Engineers, Water Environment Association of Texas, Texas Association of Realtors, Texas Dental Association, Texas Hospital Association, Texas Eagle Forum, the Combined Law Enforcement Association of Texas, and many other conservative organizations in Texas.

In his six terms in office, Bill has established himself as a no-nonsense, conservative leader. As one of only two licensed engineers in the House of Representatives, he has brought unique professionalism and expertise to the Legislative process. Bill’s strong background as a business community leader, his high energy level, and his high ethical and moral standards has earned the respect of his fellow legislators. He takes this job very seriously, and considers it an honor and a privilege to serve his constituents in Texas House District 132.