J. William "Bill" Callison
About J. William Callison
J. William Callison is a lawyer based in Denver, CO and has been recognized in The Best Lawyers in America® since 2006. J. William Callison is recognized in the following practice areas:
- Denver, Colorado
- Corporate Law
- Nonprofit / Charities Law
- Tax Law
Current Firm: Holland & Hart LLP
Education: University of Colorado at Boulder, J.D., graduated 1982
Location: Denver, CO
Nearby Lawyers
Matt Sullivan is one of the leaders of the Messner Reeves Real Estate practice group. Matt is specialized in handling Medical, Restaurant & Hospitality Practice Groups, Corporate, and Banking & Financial Groups. Matt brings an unparalleled blend of expertise and experience, with a proven track record in delivering exceptional results.
Laura Sturges is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law. Laura, who practices law in Denver, Colorado, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Laura is held by other top lawyers in the same geographic and legal practice area.
Heath J. Briggs is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. Heath J., who practices law in Denver, Colorado, has been recognized since 2019. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Heath J. is held by other top lawyers in the same geographic and legal practice area.
Lauren E. Schwartzreich is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Labor and Employment. Lauren E., who practices law in Denver, Colorado, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Lauren E. is held by other top lawyers in the same geographic and legal practice area.
Kristin R.B. White is a partner in the firm's Denver office. Kristin regularly counsels and defends clients in regulatory workplace safety matters, and often acts as crisis management counsel for employers across all industries. She acts as a strong advocate for her clients before government agencies and administrative boards, such as the Occupational Safety and Health Review Commission (OSHRC), the Federal Mine Safety and Health Review Commission (FMSHRC), and various state Occupational Safe...
John H. Tatlock is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. John H., who practices law in Denver, Colorado, has been recognized since 2015. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which John H. is held by other top lawyers in the same geographic and legal practice area.
Patricia A. Riley is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law, Family Law Arbitration and Family Law Mediation. Patricia A., who practices law in Denver, Colorado, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Patricia A. is held by other top lawyers in the same geographic and legal practice area.
Matt Hogan is a Member of the firm’s Public Finance Department and has been active in public finance for over twenty-five years. Mr. Hogan’s area of practice consists of work as bond counsel, disclosure counsel, underwriter’s counsel and private placement counsel. He has represented clients in connection with the financing of utilities, airport, mass transit, manufacturing, housing and healthcare facilities. He has addressed a wide area of public finance topics as an individ...
During 40+ years of practicing law, Pat has handled almost every conceivable type of civil, criminal or administrative matter. He has been involved in government investigations, grand jury matters, malpractice cases (legal and medical), securities fraud and anti-trust cases. Pat served as the Assistant City Attorney in Lakewood, Colorado from 1973-1974, the Assistant Attorney General for the State of Colorado from 1975-1978 and an Assistant Federal Public Defender for the District of Colorado...
Explore and Learn
2026 Best Lawyers Awards: Recognizing Legal Talent Across the United States
by Jamilla Tabbara
The 2026 editions highlight the top 5% of U.S. attorneys, showcase emerging practice areas and reveal trends shaping the nation’s legal profession.
Gun Rights for Convicted Felons? The DOJ Says It's Time.
by Bryan Driscoll
It's more than an administrative reopening of a long-dormant issue; it's a test of how the law reconciles the right to bear arms with protecting the public.
2026 Best Lawyers Awards in Canada: Marking 20 Years of Excellence
by Jamilla Tabbara
Honoring Canada’s most respected lawyers and spotlighting the next generation shaping the future of law.
How to Sue for Defamation: Costs, Process and What to Expect
by Bryan Driscoll
Learn the legal standards, costs and steps involved when you sue for defamation, including the difference between libel and slander.
Best Lawyers 2026: Discover the Honorees in Brazil, Mexico, Portugal, South Africa and Spain
by Jamilla Tabbara
A growing international network of recognized legal professionals.
The Family Law Loophole That Lets Sex Offenders Parent Kids
by Bryan Driscoll
Is the state's surrogacy framework putting children at risk?
Holiday Pay Explained: Federal Rules and Employer Policies
by Bryan Driscoll
Understand how paid holidays work, when employers must follow their policies and when legal guidance may be necessary.
How to Choose a Good Lawyer: Tips, Traits and Questions to Ask
by Laurie Villanueva
A Practical Guide for Your First-Time Hiring a Lawyer
Unenforceable HOA Rules: What Homeowners Can Do About Illegal HOA Actions
by Bryan Driscoll
Not every HOA rule is legal. Learn how to recognize and fight unenforceable HOA rules that overstep the law.