Dear Roselyn (cc Rob and Eve). We decided to focus this review on the theoretical and numerical aspects of galactic dynamos. However, we do include observational results that can test the different theories. After an introduction (Section 1), we present the foundations for galactic dynamos by reviewing early examples of dynamos (Section 2), and the problem of catastrophic quenching (Section 3). Section 4 is dedicated to the test-field method, and Section 5 to the seeding mechanisms for galactic dynamos, including early turbulent amplification in the primordial CGM. Section 6 focuses on galactic mean-field dynamos. Sections 7 and 8 review numerical simulations of ISM turbulence that lead to dynamo action, on gradually larger scales: from galaxy portions, to isolated galaxies, to galaxy mergers, reaching the current state-of-the-art in numerical simulations of galactic dynamos. Section 9 will be dedicated to the synthesis of our review and our conclusions. We attach page 2 of our current draft, which shows the list of contents and the current page number of each section. As we started filling in some initial text for some of the sections, we kept adjusting the original outline. It seemed to us therefore that one can only have a really meaningful list of contents once much of the material is already drafted. We enjoyed working with these boxes and side notes, so if you want to provide any feedback on our more detailed writings, you may have a look at: http://norlx65.nordita.org/~brandenb/tmp/Galactic-Dynamos/paper.pdf which we would update as we go along. We understand that, at this point, your feedback might lead us to make major rearrangements. As of now, the material in the second half of the attached list of contents is only half-drafted. The current word count is ~12,000, and we have 7 figures and 3 tables, covering 25 pages plus 160 references, but we plan to use all the available space and submit the paper by the due date. Cheers, Axel & Evangelia