Meet Our Team


Bill Miller


Bill joined Houston Installation Services, Inc. as the Operations and Sales Manager in 1988 after an extensive career in consumer and medical sales. As President, Bill oversees our company’s growth and development, while setting the course for future business. Bill came up from the office furniture dealer side and joined HIS as the Operations Manager in 1988. In 1994, he took full ownership of the company, and under his leadership, the company has tripled in size and has added many new services.

He and his wife Melissa have been married for nearly 50 years and continue to work side by side in the business. In his free time, Bill can be found on his tractor at his ranch, golfing, or riding one of his two motorcycles.



Melissa Miller


Melissa serves as our Vice-President and Manager of Human Resources. Her greatest strength is her ability to work with employees and clients to create the "Customer Mania" climate.  Melissa directs training, annual planning sessions, as well as keeps our HR processes up-to-date. She is an advocate for Community Outreach and Sustainability causes, which have played a role in our growing business.

In her personal life, she enjoys spending time with her children and grandchildren, volunteering, gardening, and working on the ranch.


Juan Cerda

Juan Cerda

Project Manager

Juan began working in the furniture industry in 1998 as a furniture mover for McCoy, Inc., Houston's Steelcase dealer. While there, he advanced to the installer apprentice level in just six months, working on-site at the local Exxon facilities. Juan then took a position with Office Pavilion, the local Herman Miller dealer, where he was promoted to supervisor. He joined Houston Installation Services in 2002 as a furniture installation supervisor and quickly became a lead project supervisor. In 2014, he was promoted to the position of project manager with Houston Installation. In this new role, Juan enjoys interacting with both crews and customers providing them with service that exceeds expectations. Juan is married to another of our HIS employees, Joanne. His passion is repairing and restoring automobiles, and homes.


Tommy Twardowski

Tommy Twardowski

Project Manager

Tommy began his career in furniture installation in 1978 and started his full-time career in 1981 with Houston Installation Services. Starting as a furniture Installer, he began to develop a passion for the process of installation and learned to install all major manufacturers' lines including: Steelcase, Herman Miller, American Seating, Haworth and many others.

Within four years Tommy moved into a supervisory role managing not only the installation work but also the team of installers that represented HIS at the job sites. He moved through the ranks and became the lead project manager for HIS. Through this experience Tommy has developed great working relationships with HIS customers, helping to make their installations, relocations, service work, etc. a seamless experience. He continues to visit job sites daily to interact with the crew and customers, using his years of experience to make each job a success. Tommy is the father of two beautiful daughters and has been married to his high school sweetheart, Kathy, for 30 years. In his spare time, Tommy enjoys fishing and hunting with a large group of old friends.



Joanne Cerda

Customer Service/Accounting Manager

Joanne began her career with HIS in 2006 as a part-time bookkeeper. Coming from New Orleans after Katrina, Joanne brought with her accounting experience in the fields of construction, hospitality, and tax law.  For the past eight years, she has taken on several additional job responsibilities, including managing our Customer Service Department.

Joanne has been successful in dealing with some of the more complicated customers, helping to create the great customer relationships HIS is known for.  She is married to Juan Cerda, Project Manager, and shares his same passion for home renovation and restoration.



Debbie Harbison

Office Manager/Dispatch

Debbie Harbison has acquired a wide range of experience since the beginning with HIS in 2002.  She has progressed through a variety of responsibilities including payroll, safety, insurance, and personnel. She successfully managed some of the top customers of HIS. and is the go-to person to get a task done.

Debbie has been responsible for implementing and upgrading our administrative software products, helping with the internal flow of the business. She has also taken on the role of dispatch, creating a seamless effort to get our customers taken care of in a timely manner. In her personal life, she has been married to Scott for 13 years and has 3 daughters. Debbie spends her spare time volunteering in her community and other organizations and also spending time with family and friends.  



Charles Van Wunnik

Warehouse Manager

Charles began his career with Houston Installation Services in 2014.He spent the previous 16 years managing operations for retail companies. Charles has been instrumental in not only managing our 31,000 foot HIS warehouse but also, in helping HIS upgrade it’s knowledge of technology and improving our software. In his daily tasks, Charles thrives on improving efficiency.

In his personal life, Charles enjoys spending time with his children and cheering on his favorite NFL team, the Houston Texans.



Margaret Tollefson

Administrative Assistant

Margaret joined HIS in 2014 after a career as a Sales Assistant for various steel companies. She handles Invoicing and Accounts Payable for the team.

She enjoys spending time at the beach or with her granddaughter when not at work.



Blanca Castellon

Customer Service Representative

Blanca began her career with HIS in 2005.  She continues to “wow” our clients with her outstanding customer service- sending them quotes, work orders, and resolving their needs and concerns.

Blanca enjoys reading a good book or time with her family when not a work.



Kathy Fitzgerald

Customer Service Representative

After a 26 year career as an administrative assistant and sales manager, Kathy joined the HIS team in 2015.  She brings a wealth of knowledge and knows how to keep a customer’s job running smoothly from beginning to end.

Outside of work, she can be found baking treats for the office, taking trips, and enjoying her family.