Robert Erhard Duff is an American businessman and celebrity father. His daughters, Hilary Duff and Haylie Duff, built successful entertainment careers.
Duff followed a very different path. He developed his professional life in Texas retail, convenience stores, property interests, and long term business operations.
His biography connects private entrepreneurship with a highly visible entertainment family. Public interest often focuses on his career, marriage, children, wealth, and Houston background.
Several personal details remain private. Confirmed information presents him as a business focused father with deep roots in Houston, Texas.
Quick Bio
| Category | Details |
|---|---|
| Full Name | Robert Erhard Duff |
| Nickname | Bob Duff |
| Date of Birth | September 19, 1946 |
| Age | 79 years old as of 2026 |
| Birthplace | Houston, Texas, United States |
| Nationality | American |
| Ethnicity | White American |
| Profession | Businessman and retail entrepreneur |
| Known For | Father of Hilary Duff and Haylie Duff |
| Business Industry | Convenience stores, retail, real estate, and business development |
| Business Association | Landmark Industries and Timewise Food Stores |
| Estimated Net Worth | Between $10 million and $25 million |
| Estimated Height | Between 5 feet 8 inches and 5 feet 11 inches |
| Estimated Weight | Between 75 and 85 kilograms |
| Father | John B. Duff |
| Mother | Mary Pearl Erhard Duff |
| Sibling | Brad Duff |
| Former Wife | Susan Colleen Cobb, also known as Susan Duff |
| Current Wife | Joan Duff |
| Children | Haylie Duff and Hilary Duff |
| Grandchildren | Luca, Banks, Mae, Townes, Ryan, and Lulu |
| Residence Connection | Houston, Texas |
| Public Image | Private businessman connected to a famous entertainment family |
Early Life and Houston Roots
Robert Erhard Duff was born on September 19, 1946, in Houston, Texas. He grew up far from the Hollywood environment later associated with his daughters.
Houston offered strong opportunities in commerce, property, fuel sales, and neighborhood retail. These sectors later became important parts of Duff’s professional direction.
His early years remain largely private. Public sources do not provide detailed accounts of his schooling, childhood interests, or first employment.
Still, his long connection to Texas shaped his personal identity. He built his career around practical business management rather than public performance or celebrity attention.
That background created a clear contrast within the Duff family. His daughters moved west for entertainment opportunities, while he remained tied to Texas business.
Family Background and Personal Identity
Robert Duff was born to John B. Duff and Mary Pearl Erhard Duff. His middle name reflects his mother’s family name and preserves that connection.
He also has a brother named Brad Duff. The wider family has remained much less visible than Hilary, Haylie, and their immediate relatives.
Duff’s family identity developed around business, responsibility, and local roots. Before his daughters became famous, the surname held no major connection to national entertainment culture.
That changed during the early 2000s. Hilary’s success on Disney Channel made the Duff family familiar to millions of viewers.
Even with that attention, Robert maintained a separate public image. He remained known mainly as a businessman, father, and Houston based family figure.
Robert Erhard Duff’s Career in Texas Retail
Duff entered the retail sector and focused on convenience store operations. This industry demands careful planning, reliable locations, inventory control, and strong customer service.
He joined Landmark Industries, a Houston based company. It operated convenience stores, fuel stations, property interests, and development projects.
His work required practical management rather than public promotion. Successful operators must evaluate land, traffic patterns, supplier agreements, operating costs, and local demand.
Duff’s career grew gradually through ownership and partnerships. That approach created financial stability and strengthened his standing in Texas business circles.
His daughters later entered entertainment, but his profession remained independent from their fame. His income came primarily from commercial interests rather than celebrity opportunities.
Landmark Industries and Timewise Food Stores
Landmark Industries became an important part of Duff’s business profile. The company developed and operated convenience stores under the Timewise Food Stores name across Texas.
Timewise locations commonly combined retail products with fuel services. This model required dependable sites, efficient supply systems, recognizable branding, and consistent daily operations.
The chain expanded over many years and became familiar in several Texas markets. Its growth reflected broader demand for convenient shopping and fuel access.
Large convenience store networks also depend heavily on real estate. Strong corner locations and busy travel routes can create lasting value beyond store operations.
Duff’s association with Landmark and Timewise remains one of the clearest facts about his career. It explains much of his reported wealth and business reputation.
Business Growth and Corporate Changes
Landmark’s convenience store operations reportedly grew into a substantial regional network. Expansion required financing, property development, staffing, supplier relationships, and long term planning.
Over time, the business entered major corporate transactions. Operating assets changed hands, while property and development interests remained important parts of the wider company structure.
Such transitions often occur when private retailers reach significant scale. Owners may sell store operations while retaining land, investment interests, or separate development activities.
Duff’s career therefore extended beyond daily store management. His business profile also involved ownership, corporate stock, and assets connected to commercial real estate.
These changes help explain why exact personal wealth remains difficult to calculate. Private companies rarely disclose the detailed finances associated with individual family members.
What Is Robert Erhard Duff’s Net Worth?
Robert Duff’s net worth is commonly estimated between $10 million and $25 million. No official public statement confirms the exact amount.
The estimate reflects his connection to Landmark Industries, Timewise operations, private investments, and possible property interests. These assets can vary considerably in value.
Duff does not receive publicly reported celebrity salaries. His finances depend on ownership, transactions, corporate stock, and real estate interests.
Divorce proceedings also revealed that significant corporate assets existed within the family’s financial picture. However, those reports did not establish a precise current fortune.
For accuracy, the figure should always appear as an estimate. His actual wealth may differ because private holdings and liabilities remain undisclosed.
Robert Erhard Duff Marriage to Susan Colleen Cobb
Robert Duff married Susan Colleen Cobb, later known as Susan Duff, on July 19, 1984. Their marriage lasted for more than twenty years.
The couple welcomed two daughters. Haylie Katherine Duff was born in 1985, while Hilary Erhard Duff arrived in 1987.
Susan became highly involved in the girls’ early performing careers. She helped them pursue acting, singing, auditions, and professional opportunities in California.
Robert remained closely connected to business responsibilities in Texas. This arrangement created distance between the family’s entertainment activities and his commercial work.
Their relationship later experienced serious difficulties. The marriage eventually ended through a divorce that received attention because Hilary was already a major celebrity.
Robert Erhard Duff’s Family Tree and Grandchildren
Robert Duff’s immediate family includes his parents, John B. Duff and Mary Pearl Erhard Duff, and his brother, Brad Duff.
His two daughters form the most publicly recognized branch of the family. Haylie built a career in acting, music, television, writing, and food media.
Hilary became internationally known through Lizzie McGuire, recording projects, movies, books, producing, and business ventures. Her career strongly shaped public interest in the Duff family.
Robert is also a grandfather of six. Hilary’s children are Luca, Banks, Mae, and Townes.
Haylie has two daughters named Ryan and Lulu. These grandchildren continue the family line while largely growing up outside Robert’s business world.
Life as the Father of Hilary Duff and Haylie Duff
Robert Duff is most frequently introduced as Hilary Duff’s father. Hilary became one of the defining young stars of early 2000s family entertainment.
Her Lizzie McGuire role led to films, music, tours, books, and television work. She sustained her career beyond childhood fame.
Haylie also established an independent public identity. She acted in film and television, recorded music, wrote a cookbook, and created lifestyle content.
Robert did not manage their careers as visibly as Susan. However, his business background provided stability during their early years.
His place in their biographies therefore remains important. He represents their Texas roots and the family environment that existed before Hollywood success.
Divorce and Legal Matters
The divorce between Robert and Susan Duff became public because of financial disputes. Media coverage focused on assets, stock interests, and disagreements during the proceedings.
In 2008, a court held Robert in contempt. The ruling concerned an injunction involving the sale of family related stock.
Reports stated that the court ordered a ten day jail sentence. This legal event brought unusual attention to a man who normally avoided celebrity reporting.
The case should be described carefully and without exaggeration. It formed one difficult chapter within a longer personal and professional life.
The proceedings also showed how private family conflicts can attract national coverage when famous children are involved. Hilary’s popularity increased public interest in every development.
Private Lifestyle and Public Image
Duff has maintained a relatively private lifestyle compared with his daughters. He does not regularly promote himself through interviews, television appearances, or social media.
His public image centers on business, family connections, and Houston society. He appears more comfortable in local commercial settings than in entertainment publicity.
Financial success likely provided a comfortable lifestyle, but specific homes, vehicles, and personal expenses remain private. Reliable sources do not support extravagant claims.
He has also appeared at selected community and cultural events. These appearances suggest continued involvement in social and philanthropic circles within Texas.
Overall, Duff presents the image of a private entrepreneur. His fame remains indirect and comes mainly from his daughters’ public achievements.
Relationship With His Daughters and Family Legacy
Public reporting has sometimes described complicated family dynamics between Robert and his daughters. Divorce, distance, finances, and fame likely created additional pressure.
However, private relationships cannot be fully measured through interviews or entertainment reports. Responsible biography writing should avoid assigning motives without direct evidence.
His family legacy remains clear despite those complexities. Hilary became a successful actor, singer, producer, author, and entrepreneur with lasting cultural influence.
Haylie developed her own path in acting, music, television, food, and lifestyle media. Both daughters expanded the Duff name far beyond its Texas business roots.
Robert’s legacy therefore includes both commercial achievement and family influence. His story remains connected to entrepreneurship, fatherhood, and a famous entertainment household.
Philanthropy and Community Presence
Robert Duff has supported charitable and cultural activities in Houston. Reports connect him with fundraising dinners, arts events, and community gatherings.
These activities fit the profile of an established local businessman. Community participation often supports cultural institutions, nonprofit programs, and regional development.
Available information does not present him as a full time philanthropist. Still, selected public appearances show engagement beyond private commercial interests.
His community presence also strengthens his connection to Houston society. He remained rooted in the city even as his daughters built careers in California.
This part of his biography adds balance. It shows a businessman connected not only to wealth and family fame, but also to local civic life.
Final Thoughts
Robert Erhard Duff is a Texas entrepreneur. His private life gained attention through Hilary Duff and Haylie Duff.
His career centers on retail growth and property interests. Landmark Industries and Timewise Food Stores shaped his business identity.
His personal life includes marriage, fatherhood, divorce, legal disputes, grandchildren, and continued ties to Houston. Some private details remain unavailable or unconfirmed.
That limited information makes careful wording essential. Estimates concerning his net worth, height, weight, and private assets should never appear as confirmed facts.
Overall, Duff represents the business foundation behind a famous entertainment family. His biography combines entrepreneurship, family complexity, privacy, and a lasting Texas identity.
Frequently Asked Questions
Who Is Robert Erhard Duff?
Robert Erhard Duff is an American businessman from Houston. He is best known as the father of actresses and entertainers Hilary Duff and Haylie Duff.
He has been associated with Landmark Industries and Timewise Food Stores. His career developed mainly through retail, convenience stores, property, and business investment.
How Old Is Robert Erhard Duff?
Robert Erhard Duff was born on September 19, 1946. He is 79 years old during most of 2026.
His birthplace is Houston, Texas. Public biographies consistently connect his personal identity and business career with the city.
What Is Robert Erhard Duff’s Estimated Net Worth?
His estimated net worth ranges from $10 million to $25 million. The exact amount has never been officially confirmed.
The estimate reflects private business interests, retail assets, stock, and possible real estate holdings. Those values can change over time.
Who Was Robert Erhard Duff Married To?
He was married to Susan Colleen Cobb, commonly known as Susan Duff. They married in 1984 and later divorced.
The former couple share two daughters, Haylie Duff and Hilary Duff. Robert is also reported to be married to Joan Duff.
What Are Robert Erhard Duff’s Height and Weight?
Reliable public sources do not confirm his exact height or weight. Published figures should therefore appear only as estimates.
Some profiles place him around 5 feet 8 inches to 5 feet 11 inches. His estimated weight ranges from 75 to 85 kilograms.
