This is why I am amazed when I see dysfunction between these two departments. And when I have run across firms where the relationships between the two groups exist, it usually comes from the following issues:
When I was still a newbie in the law firm environment, I made an effort to determine how the individual components of a large law firm administration functioned. I saw the power of interaction with the Partners that the Marketing team had versus the Library's operation which tended to be more service oriented and low-keyed. Both serve important functions, but the "attitude" of each group was different. Although Marketing had influence and the ear of the partners, the Library held the power of the purse strings, products, and relationships with the vendors that provide those products. Marketing had their MBAs, and the Library had their JDs/MLIS'. Marketing was a three-year revolving door of talent, and the Library had members that did orientation when the Managing Partner was a first-year Associate. The two departments have their different structures, but again, played for the same team.
Where I've seen the divisions between the two come to a head when it comes to money, is typically the Marketing Department needs a resource, and wants the Library to pay for it. In a good environment, this means that the two heads of the departments meet and work out a plan to evaluate, test, and determine what the correct product is that solves the problems faced by the Marketing team (and by proxy, the firm.) In a bad situation, the Library determines that they will not work with Marketing because the library staff will not be the ones using the product. Or, Marketing goes out and buys the product without working with the Library, and then sends the Library the invoice. These two latter situations are more common than they should be, and completely unnecessary if there is a good relationship between the groups. When it comes to money, I have a very over-simplistic approach that I take. First - It's not my money, it's the partnership's. As long as the powers-that-be approve this, it's fine. It doesn't affect the money I take home at the end or the month, it affects the money that the partners take home at the end of the month. Second, I make sure that these types of increases to my budget are made apparent to those that monitor my budget, and I show where it was approved by those powers-that-be. If the money hawks are concerned... I point them to those that approved it, but also point out that the expense was something that will help leverage our firm for the future and (hopefully) bring in new clients and revenue. We're all on the same team, so don't throw your team-mate under the bus.
When it comes to credit, this is where feelings tend to get hurt, and power trumps cooperation. The typical story is that the Library conducts research and analysis for a Marketing Business Development or Client Development project. The work is compiled and sent to Marketing, and then it is restructured (sometimes) and sent to the Partner for action. When the project is successful, Marketing gets the credit, and the library gets ignored. Again, when the two groups work cooperatively, this happens less. However, I have learned, sometimes the hard way, that when it comes to credit, the last person to handle it, tends to get the credit. This happens when reports are turned over to Accounting to add in "the numbers," or IT to add in the tech specifications, and with Marketing when it comes to analysis and action items. The best way to solve this situation is to have a conversation with the other department to make sure that the value your team put in is made clear to the other department, and when appropriate, to the partners that use the final product. It is also important to have a thick skin and sometimes understand that, while what you did was very important, credit doesn't always come back as you would like. It's okay. Put it down for your "wins" list in your annual evaluation and take credit for it then. If you're running Marketing, make an effort to credit the Library when appropriate.
This brings me to the people part of the process. Leaders that deem their value by the size of their departments are not leaders at all. (Insert [in]appropriate joke here.)
Librarians are visionaries. We tend to see trends before others and position ourselves to handle those trends. I've written many posts before where I argued that giving the "Information" title to the computer networking department was probably the biggest defeat in the Library world. We were the leaders when it came to information technology, we were the leaders when it came to knowledge management, we were the leaders when it came to competitive intelligence. We've been in the forefront of artificial intelligence and analytics. Unfortunately, we also tend to start these programs, and watch them be pulled out of our departments and sent to others, or spun off and created in a different department altogether. I am perfectly okay with that (well... mostly okay with that.) What I don't appreciate is when the Library creates a successful group, typically these days, a Competitive or Business Intelligence group, and then the Marketing department comes along and snags it away from us with the perception that this should have never been in the Library in the first place, and that it belongs in Marketing. If that is true, then why did it have to originate in the Library to begin with? Why didn't it begin in Marketing? The biggest reason is that the Library has the external relationships with the vendors and industry to build these departments. If there comes a time when it makes sense to spin them off and move them, then it's a blessing for the department that takes it over. Unfortunately, it tends to become a turf war where the acquiring department somehow belittles the Library for taking this on in the first place. That is such a silly concept an doesn't have to happen when there is a good relationship between the departments. I mentioned earlier that Librarians should not throw their team-mates under the bus. That also goes for other department leaders that leverage the Library's work to make themselves look better, or increase the size of their departments. Quite frankly, if you grab a group from within the Library to make your own, you should increase the Library Director's bonus to include a recruitment stipend.
I've said this before, and I'll say it again:
ALL PROBLEMS ARE COMMUNICATION PROBLEMS!!!
If you work for the same law firm, you are on the same team. You don't have to like each other, but you cannot be successful as a firm if you are undermining each other, or you are so sensitive that you think other leaders are out to get you. Administrative departments of law firms are the grease that makes the organization run smoothly. Find ways to talk to one another. Understand the strategic goals of the firm. Fix problems that the firm is facing (the firm's problems, not your department's problems.) And, realize that when you look good, we all look good. We are all allies here. Let's act like it.