William Brennan​ • Hockessin, DE
Brennan Financial Group​ • Osaic Wealth Inc.
Read full biography below

Proactive Advisor Magazine: Bill, tell us about your background and the path of your financial-services career.

I grew up in Wilmington, Delaware, in a period when the region was booming and many families were connected to the DuPont ecosystem. My mother was a stay-at-home mom, and my father was a pediatrician in private practice, so I saw early what it meant to take care of people and be accountable to the community. We were a big family with five kids, and life had a practical rhythm—work hard, keep your commitments, and do what needs to be done.

I was always interested in science. I was fascinated by how things worked and liked anything that involved building, experimenting, or problem-solving. That interest took me to the University of Delaware, where I majored in chemistry with a math minor. During college, I worked in a research environment doing analytical chemistry involving nuclear magnetic resonance, which reinforced my adherence to precision, systems, and the discipline of following a process.

After graduation, I got married, started a family, and went where the job opportunities were. My first position was with a company involved with precious metals. When industry restructuring hit, I found a good opportunity with Equitable, which offered a solid path into financial services. I started the way many advisors did at that time, focused largely on insurance. It was a strong education in perseverance and in communicating complex ideas in plain language. You also learn quickly that success depends on consistency—doing the work every day, even when you hear “no” as often as “yes.”

Over time, I realized my passion was less about selling products and more about helping people connect financial decisions to real-life goals. I moved gradually from insurance into securities and planning. Increasingly, I became focused on helping people make good decisions in the stage of life when the stakes are highest: the distribution years. In 1995, I created Brennan Financial Group, and in the late 1990s, I earned the CFP designation. Those were important milestones because they helped me build a practice anchored in planning, process, and long-term relationships—rather than one-time transactions.

Today, our firm blends comprehensive planning with disciplined investment management. Many of our clients are retirees or near-retirees seeking clarity about retirement income, legacy planning, tax efficiency, and how long their money can reasonably last—along with an investment approach that respects risk. My background in science still shows up every day in the questions we ask, the way we model scenarios, and the emphasis we place on process and ongoing monitoring.

How do you view the mission of your firm?

I like to keep the mission simple: help people take the right next step in their financial journey. I often say the journey “starts one share at a time.” That’s not meant as a slogan—it’s a reminder that big goals are achieved through practical decisions made consistently. Our job is to move clients from uncertainty to action with a plan they can understand and follow.

I specialize in guiding clients through retirement planning, wealth management, and customized investment strategies aligned with their goals and lifestyle. We want to help simplify complex financial decisions so clients can focus on what matters most—living their lives with a sense of security.

Another part of the mission is making the experience comfortable and human. We’ve built an environment that feels more like a home than a financial institution, because people tend to make better decisions when they’re not intimidated. The goal is to talk plainly about what matters—cash flow, risk, priorities, and trade-offs—and translate those conversations into strategies clients understand and can implement with confidence.

Describe some key steps of your retirement-planning process.

We always start with discovery, and for us, it has two parts. The first is what I call the “warm and fuzzy” meeting—getting to know the client, their family, their priorities, and what they’re trying to solve. We want clients to feel comfortable asking questions, and we spend a lot of time listening before discussing recommendations.

The second part is quantitative discovery. We gather documents, build the data set, and turn it into a plan. A central output is a structured retirement document—essentially an expanded, spreadsheet-style plan that pulls together assets, income sources, spending needs, taxes, and assumptions. One of the most important questions we answer is simple but powerful: Based on these inputs, how long will the money last? We stress-test the answer with planning analytics and scenario work, and we use side-by-side comparisons to show the real trade-offs—for example, how claiming Social Security at different ages might affect lifetime cash flow and portfolio drawdown risk.

From there, we translate the plan into an implementable road map. For many retirees, that includes Social Security timing, retirement-date trade-offs, and decisions about debt reduction versus investing. It also includes portfolio structure—how to generate distributions, incorporate risk management, and help reduce the odds that a bad market sequence forces painful decisions. The objective is clarity: Clients should understand what they own, why they own it, how the cash flow is expected to work, and what decisions we will revisit if conditions change.

“My philosophy starts with a simple reality: money is what money does.”

What is your broad investment philosophy?

My philosophy starts with a simple reality: money is what money does. If you’re saving for retirement—or already retired—the purpose of capital is to work: to fund goals, generate income, and support the people and causes you care about. That mindset also puts risk and reward in the right context. Especially for retirees, being too conservative can be its own form of risk if it prevents the portfolio from generating the growth and income needed over a multi-decade retirement.

In practice, we try to combine common-sense investing with disciplined risk management. I’ve always been comfortable analyzing individual stocks, and we often focus on high-quality companies clients recognize. At the same time, markets move in cycles, and a durable portfolio needs more than “good names.” That’s where process matters—diversification, monitoring, rebalancing discipline, and strategies designed to respond when conditions change rather than relying on hope or headlines.

To this point, I believe in multi-strategy and multi-asset-class diversification and in incorporating actively managed strategies into most client portfolios. We work with third-party managers who have developed sophisticated, often algorithm-based, risk-managed strategies that can adapt to different market environments. These strategies often have the ability to adjust market exposure, even going to cash if deemed appropriate, and can use tools such as leverage or inverse positions depending on conditions.

I’m particularly drawn to sector-rotation strategies that use these tools, as well as to a newer, innovative product that applies risk-management tools to single-stock ETFs. This aligns with my long-time advocacy for growth stocks, but takes the management of those stocks to a new level. We also find third-party investment management is efficient in helping manage client portfolio distributions. Many clients are drawing monthly distributions, and the plan has to support that without forcing the sale of long-term holdings at the wrong time.

At the end of the day, the goal is not to chase headlines. It’s to manage the trade-offs thoughtfully: Participate in growth when markets are favorable, protect the downside when conditions deteriorate, and keep the client’s plan on track through inevitable surprises.​

What do you think clients value most about working with your firm?

I think clients value two things most: that we care and that we make the complex feel manageable. If you asked a long-term client to describe me, I think they would say I’m conscientious, that I care about them as a person, and that I take their goals seriously. That’s the foundation—because without trust, none of the technical work matters.

They also value how we deliver the experience. We work hard to communicate in plain language and provide clear next steps. I’m proud of the culture we’ve built around the practice—bringing in interns, involving younger professionals when appropriate, and partnering with specialists when that helps clients. Ultimately, clients should feel supported, informed, and confident that there is a team and a process behind every recommendation we make.