JGAA Volumes Volume 21, no. 6, 2017 Column planarity and partially-simultaneous geometric embedding Luis Barba, William Evans, Michael Hoffmann, Vincent Kusters, Maria Saumell, and Bettina Speckmann Vol. 21, no. 6, pp. 983-1002, 2017. Regular paper. Computing phylogenetic trees using topologically related minimum spanning trees Vol. 21, no. 6, pp. 1003-1025, 2017. Regular paper. Root demotion: efficient post-processing of layered graphs to reduce dummy vertices for hierarchical graph drawing Daniel Summer Magruder and Stefan Bonn Vol. 21, no. 6, pp. 1027-1038, 2017. Concise paper. Parameterized and approximation complexity of the detection pair problem in graphs Vol. 21, no. 6, pp. 1039-1056, 2017. Regular paper. Planarity of Overlapping Clusterings Including Unions of Two Partitions Vol. 21, no. 6, pp. 1057-1089, 2017. Regular paper. Equitable colorings of $K_4$-minor-free graphs Vol. 21, no. 6, pp. 1091-1105, 2017. Regular paper. Graphs with Obstacle Number Greater than One Leah Wrenn Berman, Glenn G. Chappell, Jill R. Faudree, John Gimbel, Chris Hartman, and Gordon I. Williams Vol. 21, no. 6, pp. 1107-1119, 2017. Concise paper.