EM SC 240N
Energy and Sustainability in Contemporary Culture



Learning Objectives Self-Check

Read through the following statements/questions. You should be able to answer all of these after reading through the content on this page. I suggest writing or typing out your answers, but if nothing else, say them out loud to yourself.

Two of the previous sources provide concise definitions of ethos (bold letters are my highlights):

  • Purdue OWL defines ethos as "the ethical appeal...based on the character, credibility, or reliability of the writer" (source: Purdue Online Writing Lab).
  • Pathosethoslogos notes that ethos is "ethical appeal, means to convince an audience of the author’s credibility or character. An author would use ethos to show to his audience that he is a credible source and is worth listening to."

Important Note

Before we go any further, please consider the following. This has caused some confusion in past classes: Despite the definition above, is NOT primarily based on demonstrating you are an ethical person (though that may be part of it). It can most easily be summed up in one word: credibility. Keep that in mind, please.

Purdue provides the following examples of ways that you can establish ethos. I highlighted a few things that are most important to consider:

  • "Use only credible, reliable sources to build your argument and cite those sources properly.
  • Respect the reader by stating the opposing position accurately.
  • Establish common ground with your audience. Most of the time, this can be done by acknowledging values and beliefs shared by those on both sides of the argument. [Another very common way to do this is to make yourself and/or your argument relatable. Getting your audience think "they are just like me" is a very common way to establish ethos.]
  • If appropriate for the assignment, disclose why you are interested in this topic or what personal experiences you have had with the topic.
  • Organize your argument in a logical, easy to follow manner. You can use the Toulmin method of logic or a simple pattern such as chronological order, most general to most detailed example, earliest to most recent example, etc.
  • Proofread the argument. Too many careless grammar mistakes cast doubt on your character as a writer."

Pathosethoslogos provides the following advice:

  • "Ethos can be developed by choosing language that is appropriate for the audience and topic (also means choosing proper level of vocabulary), making yourself sound fair or unbiased, introducing your expertise or pedigree, and by using correct grammar and syntax."

I know what you are probably thinking: This seems a bit complicated! There are a lot of rules! Actually, it's not terribly complicated. There are many ways to establish ethos (credibility) with your audience. Some of the most common are listed above, but there are others. What it boils down to is that whether you are speaking, writing, or trying to communicate in any way, anything you do to try to convince your audience that you are a credible, reliable source of information, it is ethos. Any time that someone is trying to establish credibility, they are using ethos.

Okay, now lets' get back to our original examples. Which of these sentences relies the most on ethos, and why do you think so?

  1. I think solar panels are a wonderful technology, don't you?
  2. I have been in the energy business for almost 40 years, including 30 in the oil and gas industry. But like you, I'm a cost-conscious homeowner with bills to pay. I've never seen a technology as potentially game-changing as solar panels. Those things are going to change the world, and better yet they will save you money.
  3. Did you know that Tesla Energy will install and maintain solar panels on your roof for no extra cost? You don't have to lift a finger, and you will end up paying less for electricity than you do now. You can save money and get inexpensive, clean electricity. And all of it is guaranteed by contract! I had them install panels on my house, and couldn't be happier. They'll do the same for you.
  4. You know, every time I see that old coal-fired power plant I think of all of the innocent children living nearby that are probably having asthma attacks because of the pollution. That's why I added solar panels to my roof.

If you said the second example, then give yourself a pat on the back. The language used in that narrative is a clear attempt to establish the author's credibility, in a few ways.

  • First of all, saying that "I have been in the energy business for almost 40 years" is meant to be a strong indication that I know energy. This is an attempt to establish credibility. If the person said that they were an accountant for 40 years, or a recent college grad with a History degree, would it have the same impact?
  • The assertion that the person worked in the oil and gas industry is a more subtle attempt to establish credibility, because the renewable and non-renewable industries are usually competitors. The impact of the statement would probably be different if they said they worked in the solar industry, or if you knew they sold solar PV systems.
  • The third attempt at ethos is made when the person tries to establish common ground with the reader by stating they are a cost-conscious homeowner (this strategy is pointed out by the Purdue article).

Remember, any way that a speaker or writer can establish credibility and believability is ethos. There are myriad ways of doing this, including using appropriate language, citing legitimate sources of information, dressing appropriately, speaking/writing with confidence, avoiding grammatical and/or spelling errors, and more. 

So, now that we have ethos figured out, here's a little curveball: Appeals to ethos can change from situation to situation, even if it is the same speaker or writer trying to convey the same message. The video below from our friends at Purdue University does a really good job of explaining this and goes over ethos in general as well.

To Watch Now

Please click on the link below for an explanation of ethos.

The narrators sum up ethos nicely by stating that: "In every rhetorical situation, ethos means a quality that makes the speaker believable." This "quality" can and does change all the time. Even if you don't have the credentials that render you credible on the topic, you should do your best to establish credibility by doing things like using reliable sources, proper language, and so forth. You've probably heard the truism that as a speaker or writer you need to "know your audience." Establishing ethos is one of the reasons why. You want your audience to believe you and ethos can help make that happen. Politicians are particularly (or notoriously, depending on whom you ask) good at doing this. A few examples of this can be seen below.

Try this!

Take a look at the photos of former President Obama below and think about the different ways that he is trying to establish credibility with his audience.

photos of Candidate and President Obama giving speeches
Figure 5.2: Barack Obama addresses a crowd in New Hampshire (left) and President Obama giving a TV address in the Oval Office.
Credit: Left photo: Fogster, CC SA-BY 3.0. Right photo: Public domain (Wikipedia)

Notice the stark difference in physical appearance in the photos of Barack Obama above. What messages is he sending with regards to ethos? The left photo shows the classic "sleeves rolled up" look, which politicians use to speak to "regular folks," usually in public settings like fairs, construction sites (they'll also don a hard hat for this), local restaurants, and so on. The ethos-related messaging is something like: "Hey, I'm just a regular, hard-working guy like you. I understand your problems." But by wearing a dress shirt instead of, say, a polo shirt, an air of authority and professionalism is still presented.

The photo to the right presents a much different attempt at ethos. He is projecting an image of power and authority by wearing a suit and tie, being the only person in the shot, and sitting in a well-appointed office. Even his posture is different than the other photo. Note that both an American flag and flag with the Presidential Seal is in the background. Both project authority, among other things. Do you notice anything else in the background? Do the family pictures convey a message? This is a subtle reminder that he has a family with two young children, and thus is relatable (this is probably also an example of pathos). Everything in the frame is very carefully considered before the cameras roll. (Politicians are generally obsessed with symbols and appearance.)

Photos of Pervez Musharraf meeting with assorted members of the United States Government
Figure 5.3: Pervez Musharraf, former President of Pakistan. In the left image he is meeting with the U.S. Joint Chiefs of Staff Peter Pace (2006), and meeting with former U.S. President George W. Bush on the right (2006).
Credit: Both images are public domain: links: Wikimedia Commons and Wikipedia: Bush in Islamabad.

Again, the same person can project a different ethos with a simple change of outfit. On the left, former President Musharraf is sending a reminder that he is a military general and thus has credibility when discussing military matters. If he wore the military outfit while meeting with former President Bush, he would be conveying a different message than if he was wearing a suit, as he is in the right photo. He still projects authority but in a more business-like, professional manner.

Let's go over one more example, just to hammer the point home. Say you have a question about investing money. Which out of the two people below would you ask?

headshots of John Niederhuber on the Left an Chanda Kockhar on the right
Figure 5.4: John Niederhuber and Chanda Kochhar
Credit: Left image is public domain: Wikipedia: John Niederhuber. Right image: Flickr, Eric Miller, CC BY-NC-SA 2.0.

Which person do you think is better suited to answer your question? If you said the guy on the left, you were wrong! That is John Niederhuber, former Director of the National Cancer Institute. He may be a good investor, but I'd have to do some more research to figure that out. The woman to the right is Chanda Kochhar, CEO of India's largest private sector bank. She manages nearly $125 billion in assets, and is quite a good business person/investor, according to Forbes Magazine. If I only knew their respective positions, I would definitely ask Ms. Kochhar first.

Let's assume that you picked Mr. Niederhuber (like I would if I did not do any research). There are a couple of lessons to be learned here. First of all, looks can be deceiving. Closely related to that is, do your research when determining ethos. We live in a time where there is no shortage of access to information. Use the Internet to your advantage. The third is that we are all biased. Even if you did not assume that Mr. Niederhuber was more qualified to speak to financial issues, it is very likely that the idealized image of an investment banker is almost certainly male, and, at least in the U.S., white. There is nothing to be ashamed of for thinking this - if I'm being honest, when I picture, say, an investment banker, my immediate image is a young- to middle-aged white guy with a suit and tie, despite the fact that I in no way believe that this is the only type of person suitable for or capable of this career. It actually bothers me that this happens! But we are all products of our respective environments, and most of the investment bankers and Wall Street types we are used to seeing in the U.S. are white men. This is slowly changing but, historically, women have not been granted the same opportunities as men in certain sectors, business and investing being two of them. For example, of the top 500 companies in the U.S. (the S&P 500) in 2021, an all-time record of 41 (yes, that's 41 out of 500) were headed by women. If you are counting at home, that is 8.1%. Only 4.6% of the global 500 companies are headed by women (source). This is slowly changing, but not fast enough to alter the perception of what a powerful business person "looks like."

Remember that one of the goals of this course is for you to be able to critically analyze claims being made. One important aspect of doing that is to recognize preconceived notions and biases and to try to look past them. Try to step outside of your own experience and viewpoint, and as much as possible, investigate ethos from an objective perspective.

One Final Note

It can be easy to view ethos as a way to "trick" audiences into being persuaded by someone. This can certainly happen, and often does. This is a common problem with politicians, as they never want to appear not credible. But it is important for you to know that ethos can be legitimately established. Knowing as much as possible about the source of information is an important aspect of determining credibility. For example, if I want to know about drought conditions across the U.S. I refer to the National Oceanic and Atmospheric Administration (NOAA), since I know that monitoring water conditions is one of their focuses, and that they are tasked with presenting an unbiased, scientific perspective. In short, I know that they are credible.

If the Administrator of NOAA was to give a speech or write an article, (s)he would be remiss if (s)he did not let the audience know her/his position. (S)he has credibility, but still may need to establish ethos. Doing this does not mean that (s)he is trying "trick" anyone, but it does mean that (s)he is trying to strengthen her/his argument, which if you recall is the purpose of rhetoric. Ethos is only established if the audience thinks that you and/or your argument, is credible, and that can be done without being dishonest or "tricky" in any way.

Magazine advertisement from the early 20th century stating that "more doctors smoke camels than any other cigarette."
Figure 5.5: Yes, this is a real advertisement! According to the National Institutes of Health, in the early 20th century, tobacco companies embarked on a campaign using doctors to promote smoking. These ads appeared in major national magazines. There is a clear use of ethos in these ads.
Image Credit: Flickr, Lau Ardelean, CC BY-NC-SA-2.0


There are a lot of ways to establish ethos, and they can change from audience to audience. The adage "know your audience" is an essential consideration.

Remember that ethos (despite the name) is not expressly an appeal to the audience's ethics, but to try and establish your credibility with the audience.

The most common ways to establish ethos are as follows (in no particular order):

  • Establishing yourself as someone who is knowledgeable about the topic at hand.
  • (related to the above) Communicating in a way that makes it seem like you know what you are talking about, even if you are not an expert, e.g. by using correct terminology and speaking/writing confidently.
  • Using good sources, e.g. telling the audience that you got your information from a well-regarded institution, expert, or other source of information.
  • Establishing common ground with the audience.
  • Stating things that are known to be correct or convincing the audience that you are correct.
  • Make logical, convincing arguments, e.g. by structuring them well.

Check Your Understanding

Describe one specific example of something that could establish OR compromise ethos, depending on the audience.

Optional (But Strongly Suggested)

Now that you have completed the content, I suggest going through the Learning Objectives Self-Check list at the top of the page.