Note: Titles in ALL CAPITALS have been extensively revised recently.
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| ULTIMATE X-MEN | Dorling Kindersley, 2000 | writer of afterword |
| (Uncanny) X-Men 94 | Marvel, August 1975 | script |
| (Uncanny) X-Men 95 | Marvel, October 1975 | script |
| (Uncanny) X-Men 96 | Marvel, December 1975 | writer |
| (Uncanny) X-Men 97 | Marvel, February 1976 | writer |
| (Uncanny) X-Men 98 | Marvel, April 1976 | writer |
| (Uncanny) X-Men 99 | Marvel, June 1976 | writer |
| (Uncanny) X-Men 100 | Marvel, August 1976 | writer |
| (Uncanny) X-Men 101 | Marvel, October 1976 | writer |
| (Uncanny) X-Men 102 | Marvel, December 1976 | writer |
| (Uncanny) X-Men 103 | Marvel, February 1977 | writer |
| (Uncanny) X-Men 104 | Marvel, April 1977 | writer |
| (Uncanny) X-Men 105 | Marvel, June 1977 | writer |
| (Uncanny) X-Men 106 | Marvel, August 1977 | co-writer |
| (Uncanny) X-Men 107 | Marvel, October 1977 | writer |
| (Uncanny) X-Men 108 | Marvel, December 1977 | writer |
| (Uncanny) X-Men 109 | Marvel, February 1978 | writer |
| (Uncanny) X-Men 110 | Marvel, April 1978 | writer |
| (Uncanny) X-Men 111 | Marvel, June 1978 | writer |
| (Uncanny) X-Men 112 | Marvel, August 1978 | writer |
| (Uncanny) X-Men 113 | Marvel, September 1978 | co-plot; script |
| (Uncanny) X-Men 114 | Marvel, October 1978 | co-plot; script |
| (Uncanny) X-Men 115 | Marvel, November 1978 | co-plot; script |
| (Uncanny) X-Men 116 | Marvel, December 1978 | co-plot; script |
| (Uncanny) X-Men 117 | Marvel, January 1979 | co-plot; script |
| (Uncanny) X-Men 118 | Marvel, February 1979 | co-plot; script |
| (Uncanny) X-Men 119 | Marvel, March 1979 | co-plot; script |
| (Uncanny) X-Men 120 | Marvel, April 1979 | co-plot; script |
| (Uncanny) X-Men 121 | Marvel, May 1979 | co-plot; script |
| (Uncanny) X-Men 122 | Marvel, June 1979 | co-plot; script |
| (Uncanny) X-Men 123 | Marvel, July 1979 | co-plot; script |
| (Uncanny) X-Men 124 | Marvel, August 1979 | co-plot; script |
| (Uncanny) X-Men 125 | Marvel, September 1979 | writer |
| (Uncanny) X-Men 126 | Marvel, October 1979 | writer |
| (Uncanny) X-Men 127 | Marvel, November 1979 | co-plot; script |
| (Uncanny) X-Men 128 | Marvel, December 1979 | co-plot; script |
| (Uncanny) X-Men 129 | Marvel, January 1980 | co-plot; script |
| (Uncanny) X-Men 130 | Marvel, February 1980 | co-plot; script |
| (Uncanny) X-Men 131 | Marvel, March 1980 | co-plot; script |
| (Uncanny) X-Men 132 | Marvel, April 1980 | co-plot; script |
| (Uncanny) X-Men 133 | Marvel, May 1980 | co-plot; script |
| (Uncanny) X-Men 134 | Marvel, June 1980 | co-plot; script |
| (Uncanny) X-Men 135 | Marvel, July 1980 | co-plot; script |
| (Uncanny) X-Men 136 | Marvel, August 1980 | co-plot; script |
| (Uncanny) X-Men 137 | Marvel, September 1980 | co-plot; script |
| (Uncanny) X-Men 138 | Marvel, October 1980 | co-plot; script |
| (Uncanny) X-Men 139 | Marvel, November 1980 | script |
| (Uncanny) X-Men 140 | Marvel, December 1980 | script |
| (Uncanny) X-Men 141 | Marvel, January 1981 | co-plot; script |
| Uncanny X-Men 142 | Marvel, February 1981 | co-plot; script |
| Uncanny X-Men 143 | Marvel, March 1981 | co-plot; script |
| Uncanny X-Men 144 | Marvel, April 1981 | writer |
| Uncanny X-Men 145 | Marvel, May 1981 | writer |
| Uncanny X-Men 146 | Marvel, June 1981 | writer |
| Uncanny X-Men 147 | Marvel, July 1981 | writer |
| Uncanny X-Men 148 | Marvel, August 1981 | writer |
| Uncanny X-Men 149 | Marvel, September 1981 | writer |
| Uncanny X-Men 150 | Marvel, October 1981 | writer |
| Uncanny X-Men 151 | Marvel, November 1981 | writer |
| Uncanny X-Men 152 | Marvel, December 1981 | writer |
| Uncanny X-Men 153 | Marvel, January 1982 | writer |
| Uncanny X-Men 154 | Marvel, February 1982 | writer |
| Uncanny X-Men 155 | Marvel, March 1982 | writer |
| Uncanny X-Men 156 | Marvel, April 1982 | writer |
| Uncanny X-Men 157 | Marvel, May 1982 | writer |
| Uncanny X-Men 158 | Marvel, June 1982 | writer |
| Uncanny X-Men 159 | Marvel, July 1982 | writer |
| Uncanny X-Men 160 | Marvel, August 1982 | writer |
| Uncanny X-Men 161 | Marvel, September 1982 | writer |
| Uncanny X-Men 162 | Marvel, October 1982 | writer |
| Uncanny X-Men 163 | Marvel, November 1982 | writer |
| Uncanny X-Men 164 | Marvel, December 1982 | writer |
| Uncanny X-Men 165 | Marvel, January 1983 | writer |
| Uncanny X-Men 166 | Marvel, February 1983 | writer |
| Uncanny X-Men 167 | Marvel, March 1983 | writer |
| Uncanny X-Men 168 | Marvel, April 1983 | writer |
| Uncanny X-Men 169 | Marvel, May 1983 | writer |
| Uncanny X-Men 170 | Marvel, June 1983 | writer |
| Uncanny X-Men 171 | Marvel, July 1983 | writer |
| Uncanny X-Men 172 | Marvel, August 1983 | writer |
| Uncanny X-Men 173 | Marvel, September 1983 | writer |
| Uncanny X-Men 174 | Marvel, October 1983 | writer |
| Uncanny X-Men 175 | Marvel, November 1983 | writer |
| Uncanny X-Men 176 | Marvel, December 1983 | writer |
| Uncanny X-Men 177 | Marvel, January 1984 | writer |
| Uncanny X-Men 178 | Marvel, February 1984 | writer |
| Uncanny X-Men 179 | Marvel, March 1984 | writer |
| Uncanny X-Men 180 | Marvel, April 1984 | writer |
| Uncanny X-Men 181 | Marvel, May 1984 | writer |
| Uncanny X-Men 182 | Marvel, June 1984 | writer |
| Uncanny X-Men 183 | Marvel, July 1984 | writer |
| Uncanny X-Men 184 | Marvel, August 1984 | writer |
| Uncanny X-Men 185 | Marvel, September 1984 | writer |
| Uncanny X-Men 186 | Marvel, October 1984 | co-plot; script |
| Uncanny X-Men 187 | Marvel, November 1984 | writer |
| Uncanny X-Men 188 | Marvel, December 1984 | writer |
| Uncanny X-Men 189 | Marvel, January 1985 | writer |
| Uncanny X-Men 190 | Marvel, February 1985 | writer |
| Uncanny X-Men 191 | Marvel, March 1985 | writer |
| Uncanny X-Men 192 | Marvel, April 1985 | writer |
| Uncanny X-Men 193 | Marvel, May 1985 | writer |
| Uncanny X-Men 194 | Marvel, June 1985 | writer |
| Uncanny X-Men 195 | Marvel, July 1985 | writer |
| Uncanny X-Men 196 | Marvel, August 1985 | writer |
| Uncanny X-Men 197 | Marvel, September 1985 | writer |
| Uncanny X-Men 198 | Marvel, October 1985 | co-writer |
| Uncanny X-Men 199 | Marvel, November 1985 | writer |
| Uncanny X-Men 200 | Marvel, December 1985 | writer |
| Uncanny X-Men 201 | Marvel, January 1986 | writer |
| Uncanny X-Men 202 | Marvel, February 1986 | writer |
| Uncanny X-Men 203 | Marvel, March 1986 | writer |
| Uncanny X-Men 204 | Marvel, April 1986 | writer |
| Uncanny X-Men 205 | Marvel, May 1986 | writer |
| Uncanny X-Men 206 | Marvel, June 1986 | writer |
| Uncanny X-Men 207 | Marvel, July 1986 | writer |
| Uncanny X-Men 208 | Marvel, August 1986 | writer |
| Uncanny X-Men 209 | Marvel, September 1986 | writer |
| Uncanny X-Men 210 | Marvel, October 1986 | writer |
| Uncanny X-Men 211 | Marvel, November 1986 | writer |
| Uncanny X-Men 212 | Marvel, December 1986 | writer |
| Uncanny X-Men 213 | Marvel, January 1987 | writer |
| Uncanny X-Men 214 | Marvel, February 1987 | writer |
| Uncanny X-Men 215 | Marvel, March 1987 | writer |
| Uncanny X-Men 216 | Marvel, April 1987 | writer |
| Uncanny X-Men 217 | Marvel, May 1987 | writer |
| Uncanny X-Men 218 | Marvel, June 1987 | writer |
| Uncanny X-Men 219 | Marvel, July 1987 | writer |
| Uncanny X-Men 220 | Marvel, August 1987 | writer |
| Uncanny X-Men 221 | Marvel, September 1987 | writer |
| Uncanny X-Men 222 | Marvel, October 1987 | writer |
| Uncanny X-Men 223 | Marvel, November 1987 | writer |
| Uncanny X-Men 224 | Marvel, December 1987 | writer |
| Uncanny X-Men 225 | Marvel, January 1988 | writer |
| Uncanny X-Men 226 | Marvel, February 1988 | writer |
| Uncanny X-Men 227 | Marvel, March 1988 | writer |
| Uncanny X-Men 228 | Marvel, April 1988 | writer |
| Uncanny X-Men 229 | Marvel, May 1988 | writer |
| Uncanny X-Men 230 | Marvel, June 1988 | writer |
| Uncanny X-Men 231 | Marvel, July 1988 | writer |
| Uncanny X-Men 232 | Marvel, August 1988 | writer |
| Uncanny X-Men 233 | Marvel, Early September 1988 | writer |
| Uncanny X-Men 234 | Marvel, Late September 1988 | writer |
| Uncanny X-Men 235 | Marvel, Early October 1988 | writer |
| Uncanny X-Men 236 | Marvel, Late October 1988 | writer |
| Uncanny X-Men 237 | Marvel, Early November 1988 | writer |
| Uncanny X-Men 238 | Marvel, Late November 1988 | writer |
| Uncanny X-Men 239 | Marvel, December 1988 | writer |
| Uncanny X-Men 240 | Marvel, January 1989 | writer |
| Uncanny X-Men 241 | Marvel, February 1989 | writer |
| Uncanny X-Men 242 | Marvel, March 1989 | writer |
| Uncanny X-Men 243 | Marvel, April 1989 | writer |
| Uncanny X-Men 244 | Marvel, May 1989 | writer |
| Uncanny X-Men 245 | Marvel, June 1989 | writer |
| Uncanny X-Men 246 | Marvel, July 1989 | writer |
| Uncanny X-Men 247 | Marvel, August 1989 | writer |
| Uncanny X-Men 248 | Marvel, September 1989 | writer |
| Uncanny X-Men 249 | Marvel, Early October 1989 | writer |
| Uncanny X-Men 250 | Marvel, Late October 1989 | writer |
| Uncanny X-Men 251 | Marvel, Early November 1989 | writer |
| Uncanny X-Men 252 | Marvel, Mid November 1989 | writer |
| Uncanny X-Men 253 | Marvel, Late November 1989 | writer |
| Uncanny X-Men 254 | Marvel, Early December 1989 | writer |
| Uncanny X-Men 255 | Marvel, Mid December 1989 | writer |
| Uncanny X-Men 256 | Marvel, Late December 1989 | writer |
| Uncanny X-Men 257 | Marvel, January 1990 | writer |
| Uncanny X-Men 258 | Marvel, February 1990 | writer |
| Uncanny X-Men 259 | Marvel, March 1990 | writer |
| UNCANNY X-MEN #260 | Marvel, April 1990 | writer |
| UNCANNY X-MEN #261 | Marvel, May 1990 | writer |
| UNCANNY X-MEN #262 | Marvel, June 1990 | writer |
| UNCANNY X-MEN #263 | Marvel, Early July 1990 | writer |
| UNCANNY X-MEN #264 | Marvel, Late July 1990 | writer |
| UNCANNY X-MEN #265 | Marvel, Early August 1990 | writer |
| UNCANNY X-MEN #266 | Marvel, Late August 1990 | writer |
| UNCANNY X-MEN #267 | Marvel, Early September 1990 | writer |
| UNCANNY X-MEN #268 | Marvel, Late September 1990 | writer |
| UNCANNY X-MEN #269 | Marvel, October 1990 | writer |
| UNCANNY X-MEN #270 | Marvel, November 1990 | writer |
| UNCANNY X-MEN #271 | Marvel, December 1990 | writer |
| UNCANNY X-MEN #272 | Marvel, January 1991 | writer |
| UNCANNY X-MEN #273 | Marvel, February 1991 | writer |
| UNCANNY X-MEN #274 | Marvel, March 1991 | script |
| UNCANNY X-MEN #275 | Marvel, April 1991 | writer |
| UNCANNY X-MEN #276 | Marvel, May 1991 | writer |
| UNCANNY X-MEN #277 | Marvel, June 1991 | writer |
| UNCANNY X-MEN #278 | Marvel, July 1991 | writer |
| UNCANNY X-MEN #279 | Marvel, August 1991 | writer, pp. 1-12 |
| UNCANNY X-MEN #379 | Marvel, April 2000 | script, uncredited |
| UNCANNY X-MEN #381 | Marvel, June 2000 | writer |
| UNCANNY X-MEN #382 | Marvel, July 2000 | writer |
| UNCANNY X-MEN #383 | Marvel, August 2000 | writer |
| UNCANNY X-MEN #384 | Marvel, September 2000 | writer |
| UNCANNY X-MEN #385 | Marvel, October 2000 | writer |
| UNCANNY X-MEN #386 | Marvel, November 2000 | writer |
| UNCANNY X-MEN #387 | Marvel, December 2000 | writer |
| UNCANNY X-MEN #388 | Marvel, January 2001 | writer |
| UNCANNY X-MEN #389 | Marvel, February 2001 | writer |
| (Uncanny) X-Men Annual 3 | Marvel, 1979 | writer |
| (Uncanny) X-Men Annual 4 | Marvel, 1980 | writer |
| (Uncanny) X-Men Annual 5 | Marvel, 1981 | writer |
| (Uncanny) X-Men Annual 6 | Marvel, 1982 | writer |
| (Uncanny) X-Men Annual 7 | Marvel, 1983 | writer |
| (Uncanny) X-Men Annual 8 | Marvel, 1984 | writer |
| (Uncanny) X-Men Annual 9 | Marvel, 1985 | writer |
| (Uncanny) X-Men Annual 10 | Marvel, 1986 | writer |
| (Uncanny) X-Men Annual 11 | Marvel, 1987 | writer |
| (Uncanny) X-Men Annual 12 | Marvel, 1988 | writer of two stories |
| (UNCANNY) X-MEN ANNUAL #14 | Marvel, 1990 | writer of two stories |
| Unknown Worlds of Science Fiction 1 | Marvel/Curtis, January 1975 | member of editorial staff |
| Unknown Worlds of Science Fiction 2 | Marvel/Curtis, March 1975 | member of editorial staff |
| Unknown Worlds of Science Fiction 3 | Marvel/Curtis, May 1975 | "staff and such" |