If the poster is based on your results (and not the contributions that a thesis advisor would typically make in order to get an M.S. thesis running) then this would be a serious breach of academic etiquette. If this is the case (and I do not know the facts), the two authors of this poster might be in big trouble, if you choose to pursue this.

There are several options:

1. Seek a clarifying talk with your thesis advisor and explain that you feel that your contributions were material, but not acknowledged. If your advisor agrees, they can work with Springer to make you an author after the fact or add a citation of your thesis. Making you an author is difficult for Springer since you had no chance to formally approve the poster before submission.

2. Go to the department chair or an ombudsman and make a formal complaint.

3. Do nothing.

Usually, these situations are murky. You did not participate in the writing of the poster, which makes an ex post facto authorship difficult to defend. The importance of your contribution can be difficult to assess, especially in a poster that by nature has little narrative. An M.S. thesis usually doesn't have the same amount of research as a Ph.D. thesis and often contains the working out of others' ideas. It is possible that people assessing the situation will conclude that your contributions were not material or not substantial, even if you would be justified in feeling differently.

There is also the question of what you want. Posters only count marginally towards publication records, so if you want to pursue an academic career, this might not make a difference in the long run. Of course, it could be useful in finding a situation as a doctoral student. A formal complaint, even if sustained, would have difficulties to indemnify you. There is also important fall-out that can make your life harder. Forcing your advisor to formally apologize to you will cement a bad relationship forever, for example.

Since you are upset enough to post under your real name, you need to look at your mental health first, such as verifying that the insult you feel has actually happened. With other words, find someone who knows your thesis and the poster that tells you whether there is something bad there. For example, it could be that you mis-read the title for contents. You want to make sure that this is NOT the case before thinking about what to do.

If the poster is based on your results (and not the contributions that a thesis advisor would typically make in order to get an M.S. thesis running) then this would be a serious breach of academic etiquette. If this is the case (and I do not know the facts), the two authors of this poster might be in big trouble, if you choose to pursue this.

There are several options:

1. Seek a clarifying talk with your thesis advisor and explain that you feel that your contributions were material, but not acknowledged. If your advisor agrees, they can work with Springer to make you an author after the fact or add a citation to your thesis. Making you an author is difficult for Springer since you had no chance to formally approve the poster before submission.

2. Go to the department chair or an ombudsman and make a formal complaint.

3. Do nothing.

Usually, these situations are murky. You did not participate in the writing of the poster, which makes an ex-post facto authorship difficult to defend. The importance of your contribution can be difficult to assess, especially in a poster that by nature has little narrative. An M.S. thesis usually doesn't have the same amount of research as a Ph.D. thesis and often contains the working out of others' ideas. It is possible that people assessing the situation will conclude that your contributions were not material or not substantial, even if you would be justified in feeling differently.

There is also the question of what you want. Posters only count marginally towards publication records, so if you want to pursue an academic career, this might not make a difference in the long run. Of course, it could be useful in finding a situation as a doctoral student. A formal complaint, even if sustained, would have difficulties to indemnify you. There is also an important fall-out that can make your life harder. Forcing your advisor to formally apologize to you will cement a bad relationship forever, for example.

Since you are upset enough to post under your real name, you need to look at your mental health first, such as verifying that the insult you feel has actually happened. In other words, find someone who knows your thesis and the poster that tells you whether there is something bad there. For example, it could be that you misread the title for contents. You want to make sure that this is NOT the case before thinking about what to do.

If the poster is based on your results (and not the contributions that a thesis advisor would typically make in order to get an M.S. thesis running) then this would be a serious breach of academic etiquette. If this is the case (and I do not know the facts), the two authors of this poster might be in big trouble, if you choose to pursue this.

There are several options:

(1) Seek a clarifying talk with your thesis advisor and explain that you feel that your contributions were material, but not acknowledged. If your advisor agrees, they can work with Springer to make you an author after the fact or add a citation of your thesis. Making you an author is difficult for Springer since you had no chance to formally approve the poster before submission.

(2) Go to the department chair or an ombudsman and make a formal complaint.

(3) Do nothing.

Usually, these situations are murky. You did not participate in the writing of the poster, which makes an ex post facto authorship difficult to defend. The importance of your contribution can be difficult to assess, especially in a poster that by nature has little narrative. An M.S. thesis usually has not the same amount of research than a Ph.D. thesis and often contains the working out of others' ideas. It is possible that people assessing the situation will conclude that your contributions were not material or not substantial, even if you would be justified in feeling differently.

There is also the question of what you want. Posters only count marginally towards publication records, so if you want to pursue an academic career, this might not make a difference in the long run. Of course, it could be useful in finding a situation as a doctoral student. A formal complaint, even if sustained, would have difficulties to indemnify you. There is also important fall-out that can make your life harder. Forcing your advisor to formally apologize to you will cement a bad relationship forever, for example.

Since you are upset enough to post under your real name, you need to look at your mental health first, such as verifying that the insult you feel has actually happened. With other words, find someone who knows your thesis and the poster that tells you whether there is something bad there. For example, it could be that you mis-read the title for contents. You want to make sure that this is NOT the case before thinking about what to do.

If the poster is based on your results (and not the contributions that a thesis advisor would typically make in order to get an M.S. thesis running) then this would be a serious breach of academic etiquette. If this is the case (and I do not know the facts), the two authors of this poster might be in big trouble, if you choose to pursue this.

There are several options:

1. Seek a clarifying talk with your thesis advisor and explain that you feel that your contributions were material, but not acknowledged. If your advisor agrees, they can work with Springer to make you an author after the fact or add a citation of your thesis. Making you an author is difficult for Springer since you had no chance to formally approve the poster before submission.

2. Go to the department chair or an ombudsman and make a formal complaint.

3. Do nothing.

Usually, these situations are murky. You did not participate in the writing of the poster, which makes an ex post facto authorship difficult to defend. The importance of your contribution can be difficult to assess, especially in a poster that by nature has little narrative. An M.S. thesis usually doesn't have the same amount of research as a Ph.D. thesis and often contains the working out of others' ideas. It is possible that people assessing the situation will conclude that your contributions were not material or not substantial, even if you would be justified in feeling differently.

There is also the question of what you want. Posters only count marginally towards publication records, so if you want to pursue an academic career, this might not make a difference in the long run. Of course, it could be useful in finding a situation as a doctoral student. A formal complaint, even if sustained, would have difficulties to indemnify you. There is also important fall-out that can make your life harder. Forcing your advisor to formally apologize to you will cement a bad relationship forever, for example.

Since you are upset enough to post under your real name, you need to look at your mental health first, such as verifying that the insult you feel has actually happened. With other words, find someone who knows your thesis and the poster that tells you whether there is something bad there. For example, it could be that you mis-read the title for contents. You want to make sure that this is NOT the case before thinking about what to do.