Scientific Workforce, Innovation, Personal Perspective
The views in this piece are my own and do not necessarily reflect those of the National Postdoctoral Association or Virginia Tech.
The views in this piece are my own and do not necessarily reflect those of the National Postdoctoral Association or Virginia Tech.
Last week was National Postdoc Appreciation Week, an annual event organized by the National Postdoctoral Association (NPA) to raise awareness for the work postdocs do and encourage the institutions they work at to show their appreciation.
As someone who was a postdoctoral scholar and now works as an administrator to support postdocs, I know the value they provide to their institutions. However, many people - including those working at our institutions - either don't understand what a postdoc is or the impact they make through their research, mentorship, and teaching efforts.
As someone who was a postdoctoral scholar and now works as an administrator to support postdocs, I know the value they provide to their institutions. However, many people - including those working at our institutions - either don't understand what a postdoc is or the impact they make through their research, mentorship, and teaching efforts.
So, what is a postdoc?
The NPA has launched a whole campaign to try to better articulate that while postdocs perform important research and scholarship, they are also human beings like anyone else - mothers, fathers, leaders, volunteers, immigrants, and innovators. If you are a postdoc, I encourage you to share your story as part of the What's a Postdoc? initiative.
The definition of a postdoctoral scholar (postdoc) by the NPA reads:
"An individual who has received a doctoral degree (or equivalent) and is engaged in a temporary and defined period of mentored advanced training to enhance professional skills and research independence needed to pursue his or her chosen career path."
"An individual who has received a doctoral degree (or equivalent) and is engaged in a temporary and defined period of mentored advanced training to enhance professional skills and research independence needed to pursue his or her chosen career path."
So, if that is what a postdoc is. What do postdocs do?
The major task associated with postdoctoral scholars is helping lead and drive forward research and scholarly work at their institutions. And these institutions can range from universities and academic medical centers to national or government labs and corporations. My experience lies in supporting postdocs at universities which is what I will touch on in the rest of this piece. However, there is important emerging research that pursuing postdocs outside academic institutions does not necessarily preclude one from pursuing a faculty career. Perhaps a topic for a future post.
How do postdoctoral scholars spend their time
I ran climate surveys on our postdoctoral population at North Carolina State University in 2020 and 2021 as well as at Virginia Tech in 2022. In these surveys we asked how postdocs spend their time and the distribution of their work devoted to the tasks below were remarkably consistent across survey years and institutions.
As you can see in the figure above, postdocs spend a nearly equivalent amount of their time performing research or scholarship related to their personal interests/goals and those of their supervisor(s) and that these efforts take up ~60% of their total work hours each week. It is great to see postdocs are working on their "own" research/scholarship efforts as a key point of the postdoctoral position is to develop as an independent researcher and scholar.
Writing takes up another large portion of postdocs' time (~16%) with manuscript writing being the largest area of focus outside research/scholarship. Finally, mentoring junior colleagues (7%) and teaching (6%) were tasks most postdocs reported doing as part of their roles, although there was large variation in the distribution of effort on these tasks based on the disciplinary background of the postdoc.
Clearly, then, postdocs do report focusing largely on research/scholarship but are also doing work beyond that, including mentoring others. There is data to emphasize that postdocs play a critical role in the development of research skills in Ph.D. students working in their groups. The authors of the PNAS study that investigated postdoc mentoring of graduate students discussed a "cascading mentorship model" where faculty supervisors' mentoring of postdocs allows for postdocs to then mentor their more junior colleagues. So, postdocs are both mentoring and are being mentored.
Writing takes up another large portion of postdocs' time (~16%) with manuscript writing being the largest area of focus outside research/scholarship. Finally, mentoring junior colleagues (7%) and teaching (6%) were tasks most postdocs reported doing as part of their roles, although there was large variation in the distribution of effort on these tasks based on the disciplinary background of the postdoc.
Clearly, then, postdocs do report focusing largely on research/scholarship but are also doing work beyond that, including mentoring others. There is data to emphasize that postdocs play a critical role in the development of research skills in Ph.D. students working in their groups. The authors of the PNAS study that investigated postdoc mentoring of graduate students discussed a "cascading mentorship model" where faculty supervisors' mentoring of postdocs allows for postdocs to then mentor their more junior colleagues. So, postdocs are both mentoring and are being mentored.
Given many postdocs also seek to move into future careers where they will need to mentor others, increasing the development of effective mentoring skills in this population is critical. The National Academies of Sciences, Engineering, and Medicine's report and online guide on the Science of Effective Mentoring in STEMM is a great place to start.
Why postdoc?
Many readers may wonder what is the purpose of a postdoc? How is it different from graduate school? These are good questions. Traditionally, a postdoctoral position was seen as a type of apprenticeship where aspiring faculty members (especially in the sciences and engineering fields) would be mentored by a more senior faculty member as they worked to develop the various skills (experimental design, analysis, manuscript and grant writing, people and project management, etc...) needed to become an "independent researcher". To achieve a faculty position at many research-intensive institutions a postdoctoral position is becoming essential. And data demonstrate that completing a postdoc improves scholarly productivity and positively contributes to securing a tenure-track faculty appointment. However, one can have too much postdoctoral training and experience diminishing returns from extended postdoc positions.
Many postdocs do not ultimately land faculty positions and move on to a variety of careers, post-postdoc. Additionally, while postdocs are at their institutions, they contribute importantly in a variety of ways from mentoring students (as discussed previously) to teaching and assisting in the management of their research groups. Perhaps their most important contribution to their institutions, however, is driving research and innovation forward.
Many postdocs do not ultimately land faculty positions and move on to a variety of careers, post-postdoc. Additionally, while postdocs are at their institutions, they contribute importantly in a variety of ways from mentoring students (as discussed previously) to teaching and assisting in the management of their research groups. Perhaps their most important contribution to their institutions, however, is driving research and innovation forward.
Postdocs as catalysts for technology commercialization and start-up company creation
Innovative programs that promote start-up company creation led by postdocs are gaining steam including those at Cornell University's main campus and Cornell Tech in New York City; University of Memphis; University of Washington in Seattle; Carnegie Mellon University; Duke University's Department of Biomedical Engineering; and now Virginia Tech. Postdocs are uniquely situated to help lead the commercialization efforts of new technologies emerging out of university research groups. It will be exciting to see in the years to come how these programs perform in allowing postdocs to spearhead the creation of start-up companies from universities' intellectual property.
How important are postdocs to the research enterprise at their institutions?
While many anecdotes and assumptions exist suggesting postdocs are critical drivers of research and innovation at their institutions, I have found surprisingly little analysis of this topic.
So, I set out to do a crude analysis myself.
The National Science Foundation (NSF) publishes a wealth of information on research expenditures and snapshots of the graduate student and postdoctoral scholar population at institutions across the United States. Specifically for this analysis, I leveraged data from the Fall 2020 NSF Survey of Graduate Students and Postdoctorates in Science and Engineering (most recent data available) and NSF Higher Education Research and Development (HERD) Survey data from fiscal year 2020 (released in December 2021 and the most recent data available). So, we will be comparing research expenditures from the HERD Survey (both overall and federally-funded) to postdoctorate and graduate student population size in 2020.
So, I set out to do a crude analysis myself.
The National Science Foundation (NSF) publishes a wealth of information on research expenditures and snapshots of the graduate student and postdoctoral scholar population at institutions across the United States. Specifically for this analysis, I leveraged data from the Fall 2020 NSF Survey of Graduate Students and Postdoctorates in Science and Engineering (most recent data available) and NSF Higher Education Research and Development (HERD) Survey data from fiscal year 2020 (released in December 2021 and the most recent data available). So, we will be comparing research expenditures from the HERD Survey (both overall and federally-funded) to postdoctorate and graduate student population size in 2020.
Caveats: NSF data on population counts are self-reported and institutions are left to determine the best process for counting their graduate student and postdoc population. Postdoc population counts can be quite variable (see this blog post from Gary McDowell for more on that).
In addition, I removed three institutional data points as they vastly skewed the postdoc data in particular: Johns Hopkins (1,723 postdocs in 2020), Harvard (5,787 postdocs), and Stanford (2,446 postdocs) all had postdoc populations >2.5 standard deviations of the mean postdoc count of all reporting institutions in 2020 (mean postdoc count: 260, Std Dev: 520). In addition, Johns Hopkins research expenditures are nearly double that of the next largest institution (University of Michigan), making its data an outlier on both metrics - postdoc counts and research expenditures. With those outliers removed we are left with 200 institutions who reported postdoc counts in 2020.
Let's look at the correlation between the number of postdocs at an institution and its overall research expenditures in 2020.
In addition, I removed three institutional data points as they vastly skewed the postdoc data in particular: Johns Hopkins (1,723 postdocs in 2020), Harvard (5,787 postdocs), and Stanford (2,446 postdocs) all had postdoc populations >2.5 standard deviations of the mean postdoc count of all reporting institutions in 2020 (mean postdoc count: 260, Std Dev: 520). In addition, Johns Hopkins research expenditures are nearly double that of the next largest institution (University of Michigan), making its data an outlier on both metrics - postdoc counts and research expenditures. With those outliers removed we are left with 200 institutions who reported postdoc counts in 2020.
Let's look at the correlation between the number of postdocs at an institution and its overall research expenditures in 2020.
An R-squared value of 0.81 demonstrates a very strong correlation between the number of postdocs at an institution and its overall research expenditures in a given year. The R-squared value between postdoc counts and federally-funded research expenditures was 0.75. As a reminder correlation does not equal causation but clearly there is a strong association between research expenditures and number of postdocs at an institution.
Plotting the same 200 institution's fulltime Ph.D. student populations against research expenditures we see a strong but weaker correlation.
Plotting the same 200 institution's fulltime Ph.D. student populations against research expenditures we see a strong but weaker correlation.
The R-squared value between number of Ph.D. students and federally-funded research expenditures was 0.59.
The trendline equations for the relationships plotted above can be used to "measure" how research expenditures associate with either the number of postdocs or Ph.D. students.
REMINDER: This is an overly simplistic interpretation of the data as there are many factors we aren't looking at here but for sake of argument, let's run the math.
The trendline equations for the relationships plotted above can be used to "measure" how research expenditures associate with either the number of postdocs or Ph.D. students.
REMINDER: This is an overly simplistic interpretation of the data as there are many factors we aren't looking at here but for sake of argument, let's run the math.
For the postdoc vs research expenditure trendline: y=1038.4x + 81898
Where x=postdoc number & y=research expenditure (in $1000).
If x=1; y=82,936.4
So, based on these overly simplified (and not to be taken literally) data, 1 postdoc equates to $82,936,400 in research expenditures & 1,000 postdocs to $1,120,298,000 or $1.12 billion in research expenditures.
If we do the same math for Ph.D. students, 1 Ph.D. student equates to $48,629,790 in research expenditures & 1,000 Ph.D. students to $331,137,000 or $330 million in research expenditures.
So, while this is a very crude analysis, hopefully it emphasizes the very strong relationship between postdocs and research "output" (ie, expenditures of funds on research) at institutions AND that this relationship is stronger than for Ph.D. students who also lead research will making progress towards their degree.
Where x=postdoc number & y=research expenditure (in $1000).
If x=1; y=82,936.4
So, based on these overly simplified (and not to be taken literally) data, 1 postdoc equates to $82,936,400 in research expenditures & 1,000 postdocs to $1,120,298,000 or $1.12 billion in research expenditures.
If we do the same math for Ph.D. students, 1 Ph.D. student equates to $48,629,790 in research expenditures & 1,000 Ph.D. students to $331,137,000 or $330 million in research expenditures.
So, while this is a very crude analysis, hopefully it emphasizes the very strong relationship between postdocs and research "output" (ie, expenditures of funds on research) at institutions AND that this relationship is stronger than for Ph.D. students who also lead research will making progress towards their degree.
While research expenditures are perhaps not the best metrics of "output" from postdocs or Ph.D. students, it is available data we have. Long term, we must do a better job of understanding the impact of graduate students and postdocs on not only research/scholarship and innovation but the teaching and outreach mission of many of institutions.
I discussed the need to better measure the impact of postdocs in a prior blog post from 2020 and there is still much to do in that regard.
I discussed the need to better measure the impact of postdocs in a prior blog post from 2020 and there is still much to do in that regard.
Concluding Thoughts
Postdoctoral scholars do a lot. Clearly they play a large role in research output at their institutions but are also critical mentors for many working in research groups and universities and other academically-focused research organizations.
While it is difficult to fully capture the impact postdocs make, those of us who work in this space know it is large and often underappreciated. We must do better to measure and report on postdoc impact moving forward. Why? Because if institutions don't find a better way to understand postdoc impact, they will not invest in supporting them. This in turn, will make the postdoc path less desirable. In fact, that is already happening, with many faculty reporting difficulties in recruiting postdocs. Granted, some institutions - St. Jude Children's Research Hospital and the Van Andel Institute in particular - are working hard to increase compensation for their postdocs but systemic barriers (grant budgets, organizational classification of postdocs as non-employees, etc...) make it challenging for compensation and benefits to be increased for many postdocs. Add these challenges to the opportunity cost in pursuing a postdoc and one should not be surprised to see Ph.D.s pursuing different paths post-degree.
It is my belief that we must think of creative ways to reimagine the postdoc experience to make it a more holistic training experience that sets those who pursue it up for success. The innovation postdoc fellowship programs I mentioned earlier are one example but I think a variety of creative solutions could be proposed. To begin with, though, we must all do better in collecting and reporting on data that allows us to advocate for postdocs and the critical roles they play at our institutions and beyond.
While it is difficult to fully capture the impact postdocs make, those of us who work in this space know it is large and often underappreciated. We must do better to measure and report on postdoc impact moving forward. Why? Because if institutions don't find a better way to understand postdoc impact, they will not invest in supporting them. This in turn, will make the postdoc path less desirable. In fact, that is already happening, with many faculty reporting difficulties in recruiting postdocs. Granted, some institutions - St. Jude Children's Research Hospital and the Van Andel Institute in particular - are working hard to increase compensation for their postdocs but systemic barriers (grant budgets, organizational classification of postdocs as non-employees, etc...) make it challenging for compensation and benefits to be increased for many postdocs. Add these challenges to the opportunity cost in pursuing a postdoc and one should not be surprised to see Ph.D.s pursuing different paths post-degree.
It is my belief that we must think of creative ways to reimagine the postdoc experience to make it a more holistic training experience that sets those who pursue it up for success. The innovation postdoc fellowship programs I mentioned earlier are one example but I think a variety of creative solutions could be proposed. To begin with, though, we must all do better in collecting and reporting on data that allows us to advocate for postdocs and the critical roles they play at our institutions and beyond.
For Further Reading
From the Blog
Papers and Programs of Potential Interest
United States National Postdoc Survey results and the interaction of gender, career choice and mentor impact
Career choices of underrepresented and female postdocs in the biomedical sciences
Surveying the experience of postdocs in the United States before and during the COVID-19 pandemic
A startup postdoc program as a channel for university technology transfer: the case of the Runway Startup Postdoc Program at the Jacobs Technion–Cornell Institute at Cornell Tech
Postdocs to Innovators program (consortium of European universities and partners)
Virginia Tech Presidential Postdoctoral Fellowship Program
From the Blog
- Measuring Postdoc Impact
- Reimagining the Postdoc Experience
- Factors That Affect Career Choice and Diversity in Science
- Ph.D. Recipients' Employment Trends: Insights from National Science Foundation (NSF) Data
- Ph.D. Employment Trends: Insights from NSF Survey of Doctorate Recipients
Papers and Programs of Potential Interest
United States National Postdoc Survey results and the interaction of gender, career choice and mentor impact
Career choices of underrepresented and female postdocs in the biomedical sciences
Surveying the experience of postdocs in the United States before and during the COVID-19 pandemic
A startup postdoc program as a channel for university technology transfer: the case of the Runway Startup Postdoc Program at the Jacobs Technion–Cornell Institute at Cornell Tech
Postdocs to Innovators program (consortium of European universities and partners)
Virginia Tech Presidential Postdoctoral Fellowship Program
RSS Feed