Victor Pais and Siddharth Bhattacharji founded SIGMA in 1985. Engineers by training, they used innovative quality, sourcing and service models to make SIGMA an international leader in the water and wastewater industry. In 2008, they had an opportunity to sell, and although they stepped away from daily operations at that point, they remained close to SIGMA and fully engaged in the industry. In 2017, they reacquired SIGMA, seeing it as a sound investment and a chance to revive the dynamic, entrepreneurial and growth driven team ethos that marked their management.With 40 years in partnership, Victor and Siddharth launched SIGMA 3.0. They mark SIGMA’s 35th year with renewed vision, energy, and commitment to the quality and service that have been their hallmark since the beginning



Larry Rybacki has been in the waterworks business for 42 years, 29 of them with SIGMA. After graduating from the University of Massachusetts in 1977, Larry was headed to University of Chicago Law School. Before he enrolled, a neighbor offered him a sales job at NAPPCO, and the rest is history. By age 26, he was Vice President of Sales, and by age 33 he became President of the Company. Larry joined the SIGMA leadership team as Vice President of Sales in 1990, and became President in 2008. He has remained a steadfast presence ever since. He holds an Executive MBA from the Wharton School of Business. 




Jeff Marcus, Chief Financial Officer

Jeff Marcus has been with SIGMA for 20 years. He is responsible for planning, implementing, and overseeing all financial activity. Jeff manages all bank and lender relationships and transactions. He is a licensed CPA, and holds a Bachelor’s of Arts Degree from Queens College of the City University of New York.





Mitchell Rona, Executive Vice President 

Mitchell Rona has been with SIGMA for 30 years. He oversees all aspects of global and domestic sourcing, and specializes in supplier relationship management, business and product development, global supply chain, and sales. Mitchell has significant expertise in cradle-to-grave sourcing and supply to US-based OEM businesses serving a wide array of industries. He oversees SIGMA’s OEM sourcing business with sales in excess of $60 million, and handles global sourcing for SIGMA’s waterworks division with a spend of $150 million. Mitchell holds a bachelor’s degree from the University of Delaware and an MBA from Rutgers University.